question: What do optical tools help explain?
choices.text: nerve pathways microsomia Parallel worlds Natural world A hinged joint Supernatural world feelings navigation
choices.label: A B C D E F G H
formatted_question: What do optical tools help explain? (A) nerve pathways (B) microsomia (C) Parallel worlds (D) Natural world (E) A hinged joint (F) Supernatural world (G) feelings (H) navigation