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Latest Thomas Cremer Stories

2009-04-17 11:25:08

The eyes of nocturnal mammals have very large numbers of highly-sensitive rod photoreceptors (the cell type responsible for night vision). They have to perceive light which is less than a millionth of the intensity of daylight


Word of the Day
aphotic
  • Having no light.
  • Of or relating to the region of a body of water that is not reached by sunlight and in which photosynthesis is unable to occur.
The word 'aphotic' comes from Greek roots meaning 'without' and 'light'.
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