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This is Numberphile. We mainly post videos about mathematics and just numbers in general.

Avogadro's Number (Mole)

Avogadro's Number (Mole)

Professor Martyn Poliakoff on the Mole...

See hundreds more videos from The Prof on our chemistry channel: http://www.youtube.com/periodicvideos

Avogadro's Number uploaded for Mole Day - October 23.

Problems with Zero

Problems with Zero

ViHart on Tetrahedral Dice

ViHart on Tetrahedral Dice