Science Explorer: File Card Bridges--How many pennies will your bridge hold? - 3 views
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Mitch Weisburgh on 14 Jun 10experiment to see how many pennies a bridge made of cards will hold.
1. When you are looking at someone you love, your pupils dilate, and they do the same when you are looking at someone you hate. 2. The human head is one-quarter of our total length at birth but on...
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