brain is arguably the most complex known system. The typical human brain is 3 times the volume of a typical human breath.  It is 21 times the volume of an Apple iPhone 4.  If your brain were a cube, the edge length of a side would be 4.3 inches or about one-third of a foot.   If your brain were a sphere with a radius of 2.7 inches, what would be its volume? I got 82.38 but it is not an answer choice below   79 in^3   21 in^3   12.9 in^3

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