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The 100-m world records for quadrupedal (red points) and bipedal (gray points) human athletes with superimposed best-fit lines and coefficients of determination. The lines are extrapolated, and the available points are used to superimpose 95% confidence intervals (dotted lines). The projections intersect in 2048, when the quadrupedal 100-m sprint world record will be lower, at 9.276 s, than the bipedal world record of 9.383 s.
