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Hello there.

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

Balancing a Ruler

Balancing a Ruler

How to find a ruler's centre of gravity.

More videos with Tadashi Tokieda: http://bit.ly/tadashi_vids

Sixty Symbols (our physics channel): https://www.youtube.com/sixtysymbols

Sandpiles

Sandpiles

Incredible Formula

Incredible Formula