What causes an apple to fall from a shaken tree? Invite students to question what they "know": https://t.co/zLTXWUhKYX #histed #scichat http://pic.twitter.com/1X18RnyTup— Big History Project (@BigHistoryPro) May 25, 2017
via Twitter https://twitter.com/BigHistoryPro
May 25, 2017 at 09:15AM
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