Mathematicians     have worked out
how to calculate     the bounciness of a ball:

(the coefficient of this x the cosine of that)
+   the differential of today’s weather     all ÷ by
a piece of string     (and the speed of the train)
= the same as    dropping different balls together
and seeing which ball     has the longest bounce

Measuring how well     a person will rebound
after being dropped on     is still being worked on:

some believe     it has something to do with
the thickness of their skin           whether their stretching
reaches a breaking point     or results in       withstanding
whether they can fight and flee          how many times
the person has returned to a vertical position before

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