Why is a**2 != a * a for some floats? Languages

Why is a**2 != a * a for some floats?

I was only able to reproduce this on a Windows build of python - to be precise: Python 2.7.15 (v2.7.15:ca079a3ea3, Apr 30 2018, 16:30:26) [MSC v.1500 64 bit (AMD64)] on win32. On my arch linux box installation of python (Python 2.7.15 (default, May 1 2018, 20:16:04) [GCC 7.3.1 20180406] on...
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