BrainStuff: Do Crosswalk and 'Close Door' Buttons Really Do Anything?
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1:27
HowStuffWorks_Science
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angelKing
4 years ago $1.46 earnedReally really really really ready
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Luvlee
3 years agoReally, Really?
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1:02
Ericlaw76
3 years agoO Really?
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