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If you have a pizza with radius 'z' & height 'a', its volume is pi*z*z*a.
Whales have hip bones. Meaning they left the ocean, grew legs, decided they didn't like it, and went back to sea.
A second is the duration of 9,192,631,770 ticks of a Caesieum-133 atom.
I'm currently testing this hypothesis.
Seems to agree with experimental results.