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Nga12900
@nga12900
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0:22
How to draw a pentagon-xU
7 years ago
0:17
Friction-s4EbMx
7 years ago
0:43
The mathematics of folding a piece of paper-B_rM_c4k
7 years ago
0:18
2 cubed (and why it isn't 6)-8Kl
7 years ago