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Amazing mathematical feat
This just baffles me. A guy can calculate, in his head, the 13th root of a 200-digit number in 72 seconds.
Link:
http://en.wikipedia.org/wiki/13th_root
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Charlie
1966 912 Polo Red
1950 VW Bug
1983 VW Westfalia; 1989 VW Syncro Tristar Doka
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