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40. Take it from the Top
Clean
June 20, 2008 08:46 AM PDT

A stack of blocks seems to defy gravity in this activity by Exploratorium staff educator Don Rathjen.

Take It from the Top activity: http://www.exploratorium.edu/snacks/take_it_from_the_top/index.html

More of Don Rathjen’s activities: www.exo.net/~donr