4 ms·

Given the amount of blue (and every other visible wavelength) light the Sun puts out it seems like evolution should have handled this by now.

• philpem 7y ago
  It more or less has in mammals... though it's kind of swung the other way. Sunlight is required to produce Vitamin D, which it turns out is pretty darn important. The catch is that most people don't get enough sunlight exposure to produce enough vitamin D.
  • k__ 7y ago
    I read somewhere that getting vitamin D is easier through sunlight than people think.
    • idnefju 7y ago
      Of course it also depends on your pigmentation and where you live.
      • learc83 7y ago
        And time of year.