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Rbo15760
@rbo15760
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0:35
Key pad electronics demo-qUOaYA
7 years ago
0:21
The mathematics of folding a piece of paper-B_rM_c
7 years ago
0:26
How to draw a pentagon-xUvJhW
7 years ago
0:22
2 cubed (and why it isn't 6)-8KlJNeqe
7 years ago