question: What have explorers traditionally used to orient themselves?
choices.text: clocks sponges hairs waves vehicle osculum harpoons stars
choices.label: A B C D E F G H
fact2: Explorers have used the North Star for navigational purposes for centuries.
combinedfact: Knowledge of the stars can be used to orient explorers
formatted_question: What have explorers traditionally used to orient themselves? (A) clocks (B) sponges (C) hairs (D) waves (E) vehicle (F) osculum (G) harpoons (H) stars