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This activity (page 2) draws upon a familiar, computer-based concept related to visual resolution: pixilation.

free Ages 11 - 14 5 to 10 minutes
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Make a copy of the first stethoscope with only a cardboard tube! René Laennec invented the first stethoscope in 1819 using an actual paper tube!

free Ages 4 - 14 5 to 10 minutes