diff --git "a/demonstrations/ldieuhu/pages/page-7-0.html" "b/demonstrations/ldieuhu/pages/page-7-0.html"
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+++ "b/demonstrations/ldieuhu/pages/page-7-0.html"
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+                url("https://cdn.kastatic.org/images/learn-menu/left-background.png"),
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+             !important;background-position:
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!important;-webkit-box-align:stretch !important;-ms-flex-align:stretch !important;-webkit-align-items:stretch !important;align-items:stretch !important;border-width:0px !important;border-style:solid !important;-moz-box-sizing:border-box !important;box-sizing:border-box !important;-webkit-flex-direction:column !important;-ms-flex-direction:column !important;flex-direction:column !important;margin:0px !important;padding:0px !important;position:relative !important;z-index:0 !important;min-height:0px !important;min-width:0px !important;display:none !important;}@media screen and (max-width: 1023px) /* mediaQueries.mdOrSmaller */{._vd38ksx{display:block !important;}}._5uxlpg{-webkit-box-pack:justify !important;-ms-flex-pack:justify !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-justify-content:space-between !important;justify-content:space-between !important;margin-top:8px 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/* mediaQueries.mdOrLarger */{._ae3kwy7{-webkit-flex:1 0 50% !important;-ms-flex:1 0 50% !important;flex:1 0 50% !important;padding-right:40px !important;display:none !important;}}@media screen and (min-width: 1024px) /* mediaQueries.lgOrLarger */{._ae3kwy7{-webkit-flex:1 0 33% !important;-ms-flex:1 0 33% !important;flex:1 0 33% !important;padding-right:40px !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;}}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._ae3kwy7{-webkit-flex:1 0 100% !important;-ms-flex:1 0 100% !important;flex:1 0 100% !important;padding-right:0px !important;margin-left:-4px !important;margin-right:-4px !important;min-height:56px !important;height:56px !important;display:none !important;}}._wvjbru{-webkit-box-pack:center !important;-ms-flex-pack:center !important;-webkit-box-align:center !important;-ms-flex-align:center 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704px){._1b20dct{margin-right:0px !important;}}@media screen and (max-width: 1023px) /* mediaQueries.mdOrSmaller */{._1b20dct{margin-top:16px !important;margin-right:16px !important;}}@media screen and (max-width: 767px) /* mediaQueries.smOrSmaller */{._1b20dct{-webkit-box-align:center !important;-ms-flex-align:center !important;-webkit-box-direction:normal !important;-webkit-box-orient:horizontal !important;width:100% !important;-webkit-flex-direction:row !important;-ms-flex-direction:row !important;flex-direction:row !important;-webkit-align-items:center !important;align-items:center !important;}}._zgoueth{-webkit-box-align:center !important;-ms-flex-align:center !important;cursor:pointer !important;outline:none !important;text-decoration:underline currentcolor solid !important;color:rgba(33,36,44,0.64) !important;display:-webkit-box !important;display:-moz-box !important;display:-ms-flexbox !important;display:-webkit-flex !important;display:flex !important;-webkit-align-items:center !important;align-items:center !important;}._11l3t46e{position:absolute !important;z-index:1000 !important;display:block !important;background-color:#f7f8fa !important;border-bottom:1px solid rgba(33,36,44,0.16) !important;border-top:1px solid rgba(33,36,44,0.16) !important;left:0px !important;opacity:0.99 !important;width:100% !important;}@media screen and (min-width: 1366px){._11l3t46e{background-image:
+                url("https://cdn.kastatic.org/images/learn-menu/left-background.png"),
+                url("https://cdn.kastatic.org/images/learn-menu/right-background.png")
+             !important;background-position:
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data-webtasks-id="8c8ef0aa-5043-4d0a">Class 8</span></a></li><li data-navigable-index="9" data-webtasks-id="af3e1fb4-b1fa-4095"><a tabindex="-1" aria-label="Class 9" class="_knb39h5" href="/math/in-in-grade-9-ncert" data-webtasks-id="a0a7bb81-2c0a-49ab"><span class="_x9bdnmv" data-webtasks-id="bdb1929b-7304-4ed0">Class 9</span></a></li><li data-navigable-index="10" data-webtasks-id="cc39ccf2-902c-4e8a"><a tabindex="-1" aria-label="Class 10" class="_knb39h5" href="/math/in-in-grade-10-ncert" data-webtasks-id="8b51060a-2d61-4203"><span class="_x9bdnmv" data-webtasks-id="f5df8e2d-85f9-490a">Class 10</span></a></li><li data-navigable-index="11" data-webtasks-id="e58402b3-8121-48bf"><a tabindex="-1" aria-label="Class 11" class="_knb39h5" href="/math/in-in-grade-11-ncert" data-webtasks-id="764cfff0-d0a3-4029"><span class="_x9bdnmv" data-webtasks-id="e9b73ecb-f3a4-4812">Class 11</span></a></li><li data-navigable-index="12" data-webtasks-id="c050b13a-fb83-4123"><a tabindex="-1" 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data-webtasks-id="a566b440-2e8f-4dd3"><ul data-webtasks-id="f686615f-667d-4afa"><li data-navigable-index="41" data-webtasks-id="69ded3f7-1467-4cfb"><a tabindex="-1" class="_rwpuzd" href="/science/science-india" data-webtasks-id="83e57cbd-e586-4c29"><span class="_17zmj242" data-webtasks-id="fde35c70-98f3-4598">Science - India</span></a></li></ul><ul class="_121xeo4" data-webtasks-id="59544f2f-d324-4912"><li data-navigable-index="42" data-webtasks-id="86b703ae-a2bb-4f3d"><a tabindex="-1" aria-label="Class 9 physics" class="_knb39h5" href="/science/in-in-class9th-physics-india" data-webtasks-id="90e5da5b-73b6-4ba8"><span class="_x9bdnmv" data-webtasks-id="42b17ad5-118a-4a0f">Class 9 physics</span></a></li><li data-navigable-index="43" data-webtasks-id="f2658b75-3230-4f08"><a tabindex="-1" aria-label="Class 10 physics" class="_knb39h5" href="/science/in-in-class10th-physics" data-webtasks-id="e6f2b01e-4848-4072"><span class="_x9bdnmv" data-webtasks-id="57c512ff-3fb0-462f">Class 10 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Project</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="cf105a76-446d-4e42"><div class="_1e8pns9" data-webtasks-id="48317b3a-839e-4721" style="color: rgb(190, 38, 18);"><a aria-label="Start here" class="_1ex1wlka" href="/humanities/approaches-to-art-history" data-webtasks-id="055cb049-be89-472a"><div class="_1gyxjpg" data-webtasks-id="3bed9caf-ffb7-46b8"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/arts_humanities.png-07c77b-128c.png" class="_1qjkefo" data-webtasks-id="78158ae8-c711-4494"></div><div class="_9t9e7d" data-webtasks-id="39db9a8f-ab26-4558"><div class="_1xz0fezn" data-webtasks-id="ae8d9332-a6a2-47c4">Start here</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="95f36391-8cc5-4bca"><div class="_1e8pns9" data-webtasks-id="18b6cc98-7519-4a80" style="color: rgb(190, 38, 18);"><a aria-label="Prehistoric art" class="_1ex1wlka" href="/humanities/prehistoric-art" data-webtasks-id="caa64a06-9e1c-4353"><div class="_1gyxjpg" data-webtasks-id="8509cbed-5b1c-4a27"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/prehistoric_art.jpg-ffc751-128c.jpeg" class="_1qjkefo" data-webtasks-id="e4339ca3-8703-4d64"></div><div class="_9t9e7d" data-webtasks-id="df03f276-21cf-4423"><div class="_1xz0fezn" data-webtasks-id="9b60fef7-4d8d-4f27">Prehistoric art</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="0459ae5d-64d1-4460"><div class="_1e8pns9" data-webtasks-id="23751f2a-c16e-4caa" style="color: rgb(190, 38, 18);"><a aria-label="Ancient Mediterranean + Europe" class="_1ex1wlka" href="/humanities/ancient-art-civilizations" data-webtasks-id="d6b8619c-2c62-4d75"><div class="_1gyxjpg" data-webtasks-id="7923b217-7573-4d77"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/ancient_art_civilizations.jpg-d13bd4-128c.jpeg" class="_1qjkefo" data-webtasks-id="8fd2dc7e-0681-47e9"></div><div class="_9t9e7d" data-webtasks-id="c9e828f2-56a9-47c0"><div class="_1xz0fezn" data-webtasks-id="9ba35f87-4abf-49db">Ancient Mediterranean + Europe</div></div></a></div></li></ul></div></div></li><li class="_6b6787" data-webtasks-id="874dd2f1-170c-465b"><div class="_xu2jcg _14nthjb" data-webtasks-id="afd4559f-8d47-401d"><div class="_1m1qpko" data-webtasks-id="f7458f93-451c-4261"><h3 class="_q16zme" data-webtasks-id="8249e4ac-6715-4c7f">Biology library</h3><a class="_1u32zoma" href="/science/biology" data-webtasks-id="bbc24841-01d3-4f7a">See all (37)</a></div><div data-webtasks-id="3f3418a6-82b0-407c"><ul data-webtasks-id="92018eb5-b23c-44cc"><li class="_9yeqka" data-webtasks-id="d7c58403-0db3-4ea2"><div class="_1e8pns9" data-webtasks-id="0c337f23-6572-47a0" style="color: rgb(158, 3, 78);"><a aria-label="Intro to biology" class="_1ex1wlka" href="/science/biology/intro-to-biology" data-webtasks-id="4517ff08-17f5-4b50"><div class="_1gyxjpg" data-webtasks-id="7520b1fc-e9e8-4752"><img alt="" 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aria-expanded="false" class="_1448c3ub" href="/science/biology/intro-to-biology" data-webtasks-id="c6d1dbee-4be4-4188"><span class="_90x24ln" data-webtasks-id="d6fcc201-bd0b-4a7d">Start</span></a></div></div></div></div></li><li class="_5uxlpg" data-webtasks-id="0eb19f28-a161-4454"><div class="_1e8pns9" data-webtasks-id="e44217ac-8576-4c17" style="color: rgb(158, 3, 78);"><a aria-label="Chemistry of life" class="_1ex1wlka" href="/science/biology/chemistry--of-life" data-webtasks-id="7a22a28c-787c-4df2"><div class="_1gyxjpg" data-webtasks-id="b15a51af-9403-4271"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/biology.png-8fe25b-128c.png" class="_1qjkefo" data-webtasks-id="0d2e6e8e-662d-43a9"></div><div class="_9t9e7d" data-webtasks-id="2d1df740-4d21-4c85"><div class="_1xz0fezn" data-webtasks-id="72c23257-3599-4133">Chemistry of life</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="e750affb-13a4-4426"><div class="_1e8pns9" data-webtasks-id="f8707d3f-01f9-4f2e" style="color: rgb(158, 3, 78);"><a aria-label="Water, acids, and bases" class="_1ex1wlka" href="/science/biology/water-acids-and-bases" data-webtasks-id="3097bf7b-b2dd-437c"><div class="_1gyxjpg" data-webtasks-id="57fe472b-b57d-49e6"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/acids_bases.png-b5e1c5-128c.png" class="_1qjkefo" data-webtasks-id="c2d65ef0-b071-4caf"></div><div class="_9t9e7d" data-webtasks-id="fc8b77de-54f5-48a7"><div class="_1xz0fezn" data-webtasks-id="42dfed81-5005-4c8e">Water, acids, and bases</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="beea0273-83ea-40a7"><div class="_1e8pns9" data-webtasks-id="6980996f-825b-4bc7" style="color: rgb(158, 3, 78);"><a aria-label="Properties of carbon" class="_1ex1wlka" href="/science/biology/properties-of-carbon" data-webtasks-id="df8888c3-b175-404e"><div class="_1gyxjpg" data-webtasks-id="812efeb0-0f03-44cc"><img alt="" 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data-webtasks-id="1032755d-7e71-4551">Macromolecules</div></div></a></div></li></ul></div></div></li><li class="_6b6787" data-webtasks-id="e4c4935d-83db-4fad"><div class="_xu2jcg _14nthjb" data-webtasks-id="1e33eecc-1781-453c"><div class="_1m1qpko" data-webtasks-id="dac7b579-35b4-422d"><h3 class="_q16zme" data-webtasks-id="ea2a6c5d-5756-4b7e">Computer programming</h3><a class="_1u32zoma" href="/computing/computer-programming" data-webtasks-id="5589a984-9420-4c7e">See all (8)</a></div><div data-webtasks-id="c5159936-6797-4996"><ul data-webtasks-id="e9c05db9-555f-4c95"><li class="_9yeqka" data-webtasks-id="2ecbd42e-647f-425e"><div class="_1e8pns9" data-webtasks-id="8e88feb3-d522-4063" style="color: rgb(13, 146, 63);"><a aria-label="Intro to JS: Drawing &amp; Animation" class="_1ex1wlka" href="/computing/computer-programming/programming" data-webtasks-id="44fc9e7d-7126-4caa"><div class="_1gyxjpg" data-webtasks-id="a8f625e2-dcf4-4c7b"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/programming.png-e13016-128c.png" class="_1qjkefo" data-webtasks-id="7d63e44b-05b0-46b3"></div><div class="_9t9e7d" data-webtasks-id="a2bb45d8-6d41-4f64"><div class="_1xz0fezn" data-webtasks-id="cb674659-37ea-4609">Intro to JS: Drawing &amp; Animation</div></div></a><div class="_106eiejf" data-webtasks-id="fe6505fd-59ef-4659"><div class="_xu2jcg" data-webtasks-id="03d0ffb1-ae96-4c82"><div class="_2p63cnw" data-webtasks-id="8f8ee887-64fd-41c5"><a data-test-id="start-right" id="uid-popover-4-wb-id-anchor" role="button" aria-controls="uid-popover-4-wb-id" aria-expanded="false" class="_1448c3ub" href="/computing/computer-programming/programming" data-webtasks-id="0ba8307a-75cd-486b"><span class="_90x24ln" data-webtasks-id="6a3557cc-699e-4752">Resume</span></a></div><div class="_vd38ksx" data-webtasks-id="e5b18171-643f-4aac"><a data-test-id="start-bottom" id="uid-popover-5-wb-id-anchor" role="button" aria-controls="uid-popover-5-wb-id" aria-expanded="false" class="_1448c3ub" href="/computing/computer-programming/programming" data-webtasks-id="7b9daf11-d1a3-4e03"><span class="_90x24ln" data-webtasks-id="635fa1ed-ae72-42b7">Resume</span></a></div></div></div></div></li><li class="_5uxlpg" data-webtasks-id="08b0c14e-bbab-4dfa"><div class="_1e8pns9" data-webtasks-id="7a1414fb-9b75-4311" style="color: rgb(13, 146, 63);"><a aria-label="Intro to HTML/CSS: Making webpages" class="_1ex1wlka" href="/computing/computer-programming/html-css" data-webtasks-id="9828c250-90c4-4d2c"><div class="_1gyxjpg" data-webtasks-id="04d0e8e7-9491-4fe0"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/markup.png-8a1e75-128c.png" class="_1qjkefo" data-webtasks-id="b31b56d9-04c3-4d4d"></div><div class="_9t9e7d" data-webtasks-id="ee4577d0-5c9c-4d2b"><div class="_1xz0fezn" data-webtasks-id="72b08459-0751-451f">Intro to HTML/CSS: Making webpages</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="46fbe0d5-8f18-4eaa"><div class="_1e8pns9" data-webtasks-id="928272b4-2aa4-49b1" style="color: rgb(13, 146, 63);"><a aria-label="Intro to SQL: Querying and managing data" class="_1ex1wlka" href="/computing/computer-programming/sql" data-webtasks-id="a977dec6-c16e-4e6d"><div class="_1gyxjpg" data-webtasks-id="efe69bc2-2a7a-4a60"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/databases.png-776f54-128c.png" class="_1qjkefo" data-webtasks-id="f5b065de-7a64-4001"></div><div class="_9t9e7d" data-webtasks-id="5ac7c721-d2d3-49af"><div class="_1xz0fezn" data-webtasks-id="116e62dc-672f-43e4">Intro to SQL: Querying and managing data</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="31915181-7758-4f43"><div class="_1e8pns9" data-webtasks-id="83294940-af60-447c" style="color: rgb(13, 146, 63);"><a aria-label="Advanced JS: Games &amp; Visualizations" class="_1ex1wlka" href="/computing/computer-programming/programming-games-visualizations" data-webtasks-id="e8cd0152-0c8f-4b12"><div class="_1gyxjpg" data-webtasks-id="994ec09b-0978-4e23"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/simulations.png-955b92-128c.png" class="_1qjkefo" data-webtasks-id="61a4c12f-31fa-43ce"></div><div class="_9t9e7d" data-webtasks-id="90584479-15c5-4f3d"><div class="_1xz0fezn" data-webtasks-id="b532560b-f160-458e">Advanced JS: Games &amp; Visualizations</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="f7cd716e-3bca-487e"><div class="_1e8pns9" data-webtasks-id="d7f8f741-2b31-4497" style="color: rgb(13, 146, 63);"><a aria-label="Advanced JS: Natural Simulations" class="_1ex1wlka" href="/computing/computer-programming/programming-natural-simulations" data-webtasks-id="e6f43788-843d-4a26"><div class="_1gyxjpg" data-webtasks-id="8ab7bdae-90a0-45b6"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/simulations.png-955b92-128c.png" class="_1qjkefo" data-webtasks-id="21bd347b-b450-4e9e"></div><div class="_9t9e7d" data-webtasks-id="7349d3a6-2bcc-464b"><div class="_1xz0fezn" data-webtasks-id="a47158e6-9144-4989">Advanced JS: Natural Simulations</div></div></a></div></li></ul></div></div></li><li class="_6b6787" data-webtasks-id="38747f4d-c8ca-4c21"><div class="_xu2jcg _14nthjb" data-webtasks-id="28274e51-0442-4c02"><div class="_1m1qpko" data-webtasks-id="49139fa6-4a7a-4a5c"><h3 class="_q16zme" data-webtasks-id="7c4eacfe-7893-4ee9">Computer science</h3><a class="_1u32zoma" href="/computing/computer-science" data-webtasks-id="a587b168-c619-45c8">See all (3)</a></div><div data-webtasks-id="4c30dfb2-f1d0-40b1"><ul data-webtasks-id="6d65cedb-1893-4958"><li class="_9yeqka" data-webtasks-id="62c80d15-f389-4b28"><div class="_1e8pns9" data-webtasks-id="2321d46d-8d76-47f3" style="color: rgb(13, 146, 63);"><a aria-label="Algorithms" class="_1ex1wlka" href="/computing/computer-science/algorithms" data-webtasks-id="1b04ecd0-9d72-4d2e"><div class="_1gyxjpg" data-webtasks-id="efd362fc-9454-4fcb"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/algorithms.png-a4492d-128c.png" class="_1qjkefo" data-webtasks-id="ce15a1f3-7b3e-461b"></div><div class="_9t9e7d" data-webtasks-id="564c1d03-0e03-4ef0"><div class="_1xz0fezn" data-webtasks-id="62f0dbdb-b9b9-4a38">Algorithms</div></div></a><div class="_106eiejf" data-webtasks-id="fa30f702-03f2-449c"><div class="_xu2jcg" data-webtasks-id="2eccc2bb-b76a-45c8"><div class="_2p63cnw" data-webtasks-id="865da1c3-8903-44cb"><a data-test-id="start-right" id="uid-popover-6-wb-id-anchor" role="button" aria-controls="uid-popover-6-wb-id" aria-expanded="false" class="_1448c3ub" href="/computing/computer-science/algorithms" data-webtasks-id="6441d370-788a-4419"><span class="_90x24ln" data-webtasks-id="23678935-3747-4d36">Resume</span></a></div><div class="_vd38ksx" data-webtasks-id="fcc3aa14-fb3e-425d"><a data-test-id="start-bottom" id="uid-popover-7-wb-id-anchor" role="button" aria-controls="uid-popover-7-wb-id" aria-expanded="false" class="_1448c3ub" href="/computing/computer-science/algorithms" data-webtasks-id="e602f35c-3cfb-4606"><span class="_90x24ln" data-webtasks-id="f50ee8e7-aa27-44ff">Resume</span></a></div></div></div></div></li><li class="_5uxlpg" data-webtasks-id="0218b96e-c654-4f3f"><div class="_1e8pns9" data-webtasks-id="0b05b18a-37d7-4b2e" style="color: rgb(13, 146, 63);"><a aria-label="Cryptography" class="_1ex1wlka" href="/computing/computer-science/cryptography" data-webtasks-id="4eb4e243-c684-4443"><div class="_1gyxjpg" data-webtasks-id="d1785da5-8d42-4993"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/security.png-3de9d9-128c.png" class="_1qjkefo" data-webtasks-id="aed2308e-36bf-4ab3"></div><div class="_9t9e7d" data-webtasks-id="77419e97-5b7e-419a"><div class="_1xz0fezn" data-webtasks-id="6cf2a481-deb7-4cbd">Cryptography</div></div></a></div></li><li class="_1un4dwm9" data-webtasks-id="2ff44881-1fca-4a25"><div class="_1e8pns9" data-webtasks-id="fc5cda2f-438c-41da" style="color: rgb(13, 146, 63);"><a aria-label="Information theory" class="_1ex1wlka" href="/computing/computer-science/informationtheory" data-webtasks-id="7b67703f-7e41-471b"><div class="_1gyxjpg" data-webtasks-id="c01512fb-9d4c-42b5"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/information_theory.png-60d575-128c.png" class="_1qjkefo" data-webtasks-id="a329862a-107c-41fa"></div><div class="_9t9e7d" data-webtasks-id="81f94294-2cf1-419a"><div class="_1xz0fezn" data-webtasks-id="c7d8aa2a-57e9-4e5b">Information theory</div></div></a></div></li></ul></div></div></li><li class="_6b6787" data-webtasks-id="d09e4fd3-70bb-4899"><div class="_xu2jcg _14nthjb" data-webtasks-id="6324fe09-be76-4212"><div class="_1m1qpko" data-webtasks-id="3e9d8331-f7ef-412c"><h3 class="_q16zme" data-webtasks-id="ac944e2f-9c11-4a07">Cosmology and astronomy</h3><a class="_1u32zoma" href="/science/cosmology-and-astronomy" data-webtasks-id="f3932a00-30a3-4429">See all (4)</a></div><div data-webtasks-id="aadd848f-deaf-4a2e"><ul data-webtasks-id="369d3efa-888d-49f6"><li class="_9yeqka" data-webtasks-id="d9148246-a7c2-439f"><div class="_1e8pns9" data-webtasks-id="75748be0-9608-4c3f" style="color: rgb(158, 3, 78);"><a aria-label="Scale of the universe" class="_1ex1wlka" href="/science/cosmology-and-astronomy/universe-scale-topic" data-webtasks-id="3cc5aff2-bb68-4d8c"><div class="_1gyxjpg" data-webtasks-id="646bae02-a146-421e"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/universe_scale.png-9fa814-128c.png" class="_1qjkefo" data-webtasks-id="3b0bd7cd-c7c8-41d7"></div><div class="_9t9e7d" data-webtasks-id="5f5ad99a-a9fb-4083"><div class="_1xz0fezn" data-webtasks-id="0d298830-cefd-472e">Scale of the universe</div></div></a><div class="_106eiejf" data-webtasks-id="da6e81ed-e319-4639"><div class="_xu2jcg" data-webtasks-id="653f9ffe-cef2-4230"><div class="_2p63cnw" data-webtasks-id="68122cc3-b8ba-433a"><a data-test-id="start-right" id="uid-popover-8-wb-id-anchor" role="button" aria-controls="uid-popover-8-wb-id" aria-expanded="false" class="_1448c3ub" href="/science/cosmology-and-astronomy/universe-scale-topic" data-webtasks-id="b7d7efbb-2f09-4f83"><span class="_90x24ln" data-webtasks-id="8c2152f9-006c-4625">Start</span></a></div><div class="_vd38ksx" data-webtasks-id="04629584-7582-4585"><a data-test-id="start-bottom" id="uid-popover-9-wb-id-anchor" role="button" aria-controls="uid-popover-9-wb-id" aria-expanded="false" class="_1448c3ub" href="/science/cosmology-and-astronomy/universe-scale-topic" data-webtasks-id="37a0a15f-9c44-4e31"><span class="_90x24ln" data-webtasks-id="ee0a23f6-789c-47f7">Start</span></a></div></div></div></div></li><li class="_5uxlpg" data-webtasks-id="894352ec-4f26-4069"><div class="_1e8pns9" data-webtasks-id="7211a076-7fe1-45bf" style="color: rgb(158, 3, 78);"><a aria-label="Stars, black holes and galaxies" class="_1ex1wlka" href="/science/cosmology-and-astronomy/stellar-life-topic" data-webtasks-id="89cbc2a1-4bea-4a0e"><div class="_1gyxjpg" data-webtasks-id="fc508eca-aedc-4c45"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/stellar_life.jpg-93cb11-128c.jpeg" class="_1qjkefo" data-webtasks-id="c3e2b416-53ed-4faa"></div><div class="_9t9e7d" data-webtasks-id="2a68aa5d-163e-4dac"><div class="_1xz0fezn" data-webtasks-id="3e714748-947f-44fe">Stars, black holes and galaxies</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="ff22da0e-3d7b-40b9"><div class="_1e8pns9" data-webtasks-id="5a532508-7f81-4190" style="color: rgb(158, 3, 78);"><a aria-label="Earth geological and climatic history" class="_1ex1wlka" href="/science/cosmology-and-astronomy/earth-history-topic" data-webtasks-id="9297c348-ef80-4da8"><div class="_1gyxjpg" data-webtasks-id="54048c04-fcf6-4e22"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/earth_history.jpg-95f694-128c.jpeg" class="_1qjkefo" data-webtasks-id="bc11d979-6115-42fb"></div><div class="_9t9e7d" data-webtasks-id="65fc05ca-a5b1-4edb"><div class="_1xz0fezn" data-webtasks-id="76e4c97c-f4b8-4b00">Earth geological and climatic history</div></div></a></div></li><li class="_1un4dwm9" data-webtasks-id="b07146e3-a3d0-4295"><div class="_1e8pns9" data-webtasks-id="b583d5b9-5552-4df2" style="color: rgb(158, 3, 78);"><a aria-label="Life on earth and in the universe" class="_1ex1wlka" href="/science/cosmology-and-astronomy/life-earth-universe" data-webtasks-id="a1735b24-d1a8-452b"><div class="_1gyxjpg" data-webtasks-id="a674a486-f6ab-4bf2"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/life_on_earth.jpg-30826a-128c.jpeg" class="_1qjkefo" data-webtasks-id="8ce24c3d-2918-4881"></div><div class="_9t9e7d" data-webtasks-id="57dc3590-49bb-4555"><div class="_1xz0fezn" data-webtasks-id="a5e98fd7-8e97-4131">Life on earth and in the universe</div></div></a></div></li></ul></div></div></li><li class="_6b6787" data-webtasks-id="24780b4e-27e6-44a7"><div class="_xu2jcg _14nthjb" data-webtasks-id="03d0b581-5819-403d"><div class="_1m1qpko" data-webtasks-id="0ad68d13-9067-418a"><h3 class="_q16zme" data-webtasks-id="2b5fd5ce-8238-4f0d">Electrical engineering</h3><a class="_1u32zoma" href="/science/electrical-engineering" data-webtasks-id="0f0c4f53-dbc0-46c9">See all (9)</a></div><div data-webtasks-id="ec338df0-24e5-4b6a"><ul data-webtasks-id="a449483b-6930-42d3"><li class="_9yeqka" data-webtasks-id="a954a796-0de8-4a85"><div class="_1e8pns9" data-webtasks-id="4374ca02-ed25-4bcf" style="color: rgb(158, 3, 78);"><a aria-label="Introduction to electrical engineering" class="_1ex1wlka" href="/science/electrical-engineering/introduction-to-ee" data-webtasks-id="c5cc06b0-a654-41ee"><div class="_1gyxjpg" data-webtasks-id="53887ed7-d327-4193"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/electrical_engineering.png-da92ce-128c.png" class="_1qjkefo" data-webtasks-id="0635b75a-f5e4-4a68"></div><div class="_9t9e7d" data-webtasks-id="4b67411b-ea99-43bd"><div class="_1xz0fezn" data-webtasks-id="7d3ca87b-8404-48f4">Introduction to electrical engineering</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="d7c14391-ab24-4390"><div class="_1e8pns9" data-webtasks-id="b17c96cb-7110-49cd" style="color: rgb(158, 3, 78);"><a aria-label="Circuit analysis" class="_1ex1wlka" href="/science/electrical-engineering/ee-circuit-analysis-topic" data-webtasks-id="5f13d528-de3f-46d3"><div class="_1gyxjpg" data-webtasks-id="2e546df8-49a3-4b4b"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/electrical_engineering.png-da92ce-128c.png" class="_1qjkefo" data-webtasks-id="c218b1c7-f290-4038"></div><div class="_9t9e7d" data-webtasks-id="c09a8e09-02ab-48f5"><div class="_1xz0fezn" data-webtasks-id="4b961db3-5fa1-466c">Circuit analysis</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="0df2b537-cb1b-4981"><div class="_1e8pns9" data-webtasks-id="cb7ee5fd-ad21-4330" style="color: rgb(158, 3, 78);"><a aria-label="Amplifiers" class="_1ex1wlka" href="/science/electrical-engineering/ee-amplifiers" data-webtasks-id="f16f70ac-21f6-4f2a"><div class="_1gyxjpg" data-webtasks-id="1b4254d9-4a11-4dad"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/electrical_engineering.png-da92ce-128c.png" class="_1qjkefo" data-webtasks-id="ff46669e-45ce-4b8f"></div><div class="_9t9e7d" data-webtasks-id="ec54ce6d-5bca-4319"><div class="_1xz0fezn" data-webtasks-id="efa044ab-82b8-4e77">Amplifiers</div></div></a><div class="_106eiejf" data-webtasks-id="c628068c-b69a-4f10"><div class="_xu2jcg" data-webtasks-id="b24df8a7-c42c-40b7"><div class="_2p63cnw" data-webtasks-id="d14a3357-33b1-4830"><a data-test-id="start-right" id="uid-popover-10-wb-id-anchor" role="button" aria-controls="uid-popover-10-wb-id" aria-expanded="false" class="_1448c3ub" href="/science/electrical-engineering/ee-amplifiers" data-webtasks-id="8478b688-34de-4ac1"><span class="_90x24ln" data-webtasks-id="747c67f5-01a1-4070">Resume</span></a></div><div class="_vd38ksx" data-webtasks-id="6ab9eba9-ca12-4ce3"><a data-test-id="start-bottom" id="uid-popover-11-wb-id-anchor" role="button" aria-controls="uid-popover-11-wb-id" aria-expanded="false" class="_1448c3ub" href="/science/electrical-engineering/ee-amplifiers" data-webtasks-id="c1be461c-2f46-42f9"><span class="_90x24ln" data-webtasks-id="a738fc6e-6af2-4574">Resume</span></a></div></div></div></div></li><li class="_5uxlpg" data-webtasks-id="3747e076-72b1-4709"><div class="_1e8pns9" data-webtasks-id="f6f6f295-33e4-4f5b" style="color: rgb(158, 3, 78);"><a aria-label="Semiconductor devices" class="_1ex1wlka" href="/science/electrical-engineering/ee-semiconductor-devices" data-webtasks-id="499cb8a5-90f6-4e94"><div class="_1gyxjpg" data-webtasks-id="7a45e18d-e784-42dd"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/electrical_engineering.png-da92ce-128c.png" class="_1qjkefo" data-webtasks-id="22a144b3-281c-4460"></div><div class="_9t9e7d" data-webtasks-id="dab3ccc7-5c1c-45ce"><div class="_1xz0fezn" data-webtasks-id="1f88d2cf-e518-44eb">Semiconductor devices</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="80b215e9-e71a-45fa"><div class="_1e8pns9" data-webtasks-id="a34db2a5-885e-454b" style="color: rgb(158, 3, 78);"><a aria-label="Electrostatics" class="_1ex1wlka" href="/science/electrical-engineering/ee-electrostatics" data-webtasks-id="0b51a8f6-4576-4133"><div class="_1gyxjpg" data-webtasks-id="2b25af0b-70e3-4778"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/electrical_engineering.png-da92ce-128c.png" class="_1qjkefo" data-webtasks-id="112b10f8-49ca-4f73"></div><div class="_9t9e7d" data-webtasks-id="7edb6534-230c-4b85"><div class="_1xz0fezn" data-webtasks-id="03ab2606-7657-4970">Electrostatics</div></div></a></div></li></ul></div></div></li><li class="_6b6787" data-webtasks-id="af9226b9-7658-455a"><div class="_xu2jcg _14nthjb" data-webtasks-id="29a20526-a20a-49b9"><div class="_1m1qpko" data-webtasks-id="a77b949a-13fb-444b"><h3 class="_q16zme" data-webtasks-id="5bb12002-a8cb-4295">Macroeconomics</h3><a class="_1u32zoma" href="/economics-finance-domain/macroeconomics" data-webtasks-id="353211c4-7fb7-4c6a">See all (8)</a></div><div data-webtasks-id="85efc173-7a5d-4f6f"><ul data-webtasks-id="d8c9dc63-a715-40f8"><li class="_9yeqka" data-webtasks-id="d6fe458f-ea51-44b5"><div class="_1e8pns9" data-webtasks-id="9e47305e-ef1c-4109" style="color: rgb(167, 90, 5);"><a aria-label="Basic economics concepts" class="_1ex1wlka" href="/economics-finance-domain/macroeconomics/macro-basic-economics-concepts" data-webtasks-id="497769c9-4c2f-4821"><div class="_1gyxjpg" data-webtasks-id="7fe7a169-f429-47cc"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/macroeconomics.png-d28a4e-128c.png" class="_1qjkefo" data-webtasks-id="7419500d-5190-4039"></div><div class="_9t9e7d" data-webtasks-id="c4b0ba37-4de1-4675"><div class="_1xz0fezn" data-webtasks-id="3a15b712-3c51-48f0">Basic economics concepts</div></div></a><div class="_106eiejf" data-webtasks-id="f909ed9f-5b25-4702"><div class="_xu2jcg" data-webtasks-id="fb350355-0b5d-426c"><div class="_2p63cnw" data-webtasks-id="fa4acb0c-b460-4ecd"><a data-test-id="start-right" id="uid-popover-12-wb-id-anchor" role="button" 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href="/economics-finance-domain/macroeconomics/macro-economic-indicators-and-the-business-cycle" data-webtasks-id="da8bc8e8-6a23-41b8"><div class="_1gyxjpg" data-webtasks-id="e5662252-4921-4b23"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/macroeconomics.png-d28a4e-128c.png" class="_1qjkefo" data-webtasks-id="01ad6fac-46b4-4544"></div><div class="_9t9e7d" data-webtasks-id="28d944b9-19c9-4a39"><div class="_1xz0fezn" data-webtasks-id="fac9f392-bcaf-4371">Economic indicators and the business cycle</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="64976197-ead1-4101"><div class="_1e8pns9" data-webtasks-id="66d639d8-09ab-4bda" style="color: rgb(167, 90, 5);"><a aria-label="National income and price determination" class="_1ex1wlka" href="/economics-finance-domain/macroeconomics/aggregate-supply-demand-topic" data-webtasks-id="ef2c0859-6a92-4ca3"><div class="_1gyxjpg" data-webtasks-id="643f7fdb-6f45-4879"><img alt="" aria-hidden="true" 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data-webtasks-id="0b514471-49ce-4646">Financial sector</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="04bd09f6-e489-4597"><div class="_1e8pns9" data-webtasks-id="aa7fb51a-a8cc-4fd0" style="color: rgb(167, 90, 5);"><a aria-label="Long-run consequences of stabilization policies" class="_1ex1wlka" href="/economics-finance-domain/macroeconomics/macro-long-run-consequences-of-stabilization-policies" data-webtasks-id="427420bd-9702-4e14"><div class="_1gyxjpg" data-webtasks-id="a695967c-10f5-46a5"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/macroeconomics.png-d28a4e-128c.png" class="_1qjkefo" data-webtasks-id="9c58a358-482a-4850"></div><div class="_9t9e7d" data-webtasks-id="196faafc-4ad2-43db"><div class="_1xz0fezn" data-webtasks-id="ad313127-dc59-4286">Long-run consequences of stabilization policies</div></div></a></div></li></ul></div></div></li><li class="_6b6787" data-webtasks-id="eb34414f-b0af-4732"><div class="_xu2jcg _14nthjb" data-webtasks-id="c918e8cc-aebc-4823"><div class="_1m1qpko" data-webtasks-id="0c0ecf99-e7f5-49e9"><h3 class="_q16zme" data-webtasks-id="59dfa733-2744-4607">World history</h3><a class="_1u32zoma" href="/humanities/world-history" data-webtasks-id="b36d79bc-2974-4cf9">See all (6)</a></div><div data-webtasks-id="353d90b1-2ebf-4fb9"><ul data-webtasks-id="0c29054f-3e2c-4277"><li class="_5uxlpg" data-webtasks-id="fa97b8a5-5a49-42d5"><div class="_1e8pns9" data-webtasks-id="c209db27-5b33-406a" style="color: rgb(190, 38, 18);"><a aria-label="600 BCE - 600 CE Second-Wave Civilizations" class="_1ex1wlka" href="/humanities/world-history/ancient-medieval" data-webtasks-id="5b7b311f-1505-4c9c"><div class="_1gyxjpg" data-webtasks-id="576bd9e9-6c10-4898"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/ancient_medieval.jpg-496ef8-128c.jpeg" class="_1qjkefo" data-webtasks-id="81b387ec-3f81-4c95"></div><div class="_9t9e7d" data-webtasks-id="b95a3e84-9732-4e8e"><div class="_1xz0fezn" data-webtasks-id="a6e2422f-10c9-4517">600 BCE - 600 CE Second-Wave Civilizations</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="05602428-e51c-4a33"><div class="_1e8pns9" data-webtasks-id="e5d923bc-8509-4f90" style="color: rgb(190, 38, 18);"><a aria-label="600 - 1450 Regional and interregional interactions " class="_1ex1wlka" href="/humanities/world-history/medieval-times" data-webtasks-id="eef3c300-7ba1-4130"><div class="_1gyxjpg" data-webtasks-id="086fb60d-835f-403a"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/medieval_book.jpg-619ad6-128c.jpeg" class="_1qjkefo" data-webtasks-id="15096b34-5332-4413"></div><div class="_9t9e7d" data-webtasks-id="f77896d1-323c-4ed6"><div class="_1xz0fezn" data-webtasks-id="6d53c7d3-e0e9-4ce5">600 - 1450 Regional and interregional interactions </div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="37afd0a9-b7a6-4518"><div class="_1e8pns9" data-webtasks-id="8b6b70f3-a4f0-43c5" style="color: rgb(190, 38, 18);"><a aria-label="1450 - 1750 Renaissance and Reformation" class="_1ex1wlka" href="/humanities/world-history/renaissance-and-reformation" data-webtasks-id="6d715d80-2069-443d"><div class="_1gyxjpg" data-webtasks-id="e24b5e2f-e43e-4ecb"><img alt="" aria-hidden="true" src="https://cdn.kastatic.org/genfiles/topic-icons/icons/high_ren_florence_rome.jpg-455d88-128c.jpeg" class="_1qjkefo" data-webtasks-id="bbe2d500-69f3-4fb6"></div><div class="_9t9e7d" data-webtasks-id="7a92ff62-e3a8-4472"><div class="_1xz0fezn" data-webtasks-id="4b014b6a-1579-4658">1450 - 1750 Renaissance and Reformation</div></div></a></div></li><li class="_5uxlpg" data-webtasks-id="1e767c2c-7b52-4637"><div class="_1e8pns9" data-webtasks-id="48b547be-f1f3-4495" style="color: rgb(190, 38, 18);"><a aria-label="1750 -1900 Enlightenment and Revolution" class="_1ex1wlka" href="/humanities/world-history/1600s-1800s" 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