Growth rate with too many decimal places

[Marcos Marado]

After harevsting a plant, the next one showed up with a surprising growth rate:

  'To see things in the seed, that is genius' - Lao Tzu
  Generation: 64
  Growth rate: 13.600000000000001x

[Ngô Ngọc Đức Huy]

  Generation: 8
  Growth rate: 2.4000000000000004x

This starts at generation 8 fwiw, due to floating point error.