Leonard Monroe wonders: "What would happen if everyone in the world were to jump and land at the same time?" Post your answer in the comments. Submit your science and technology questions to fyi@popsci.com.
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Science is reinventing play, from extreme sports to gamification to ridiculous roller coasters to the playgrounds of tomorrow, and this issue is chock full of fun. Also, on a less fun note: Did global warming destroy my hometown?