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A Baffling Balloon Behavior - Smarter Every Day 113

Lifting lemon: Physics to go

Thermo Can

Amazing bead chain experiment in slow motion 

Sunset at home 

What on Earth is spin? - Brian Jones

Against the Gradient 

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Tumbler

geometric square root of 3 

DIRTI for iPad - The soundscapes

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geometric square root 

diploglossus

diploglossus

Incredible Numbers by Professor Ian Stewart