Torsion measures how sharply a curve is twisting. It is analagous to curvature. If given a vector-valued function r(t), the torsion at a given value of t is
((r' × r")· r(3) ) ||r' × r"||-2.
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Robert Falcon Scott, (1868-1912), reached the South Pole less than one month after Amundsen, but died on the return ...