I would hesitate to believe that crowds sitting around a bright fire at night will produce more viable offspring than those fumbling in the dark away from the l

I would hesitate to believe that crowds sitting around a bright fire at night will produce more viable offspring than those fumbling in the dark away from the light. The evolutionary mechanism for selecting blue-sensitive rod cells in our retinas along with red-sensitive cone cells must surely be unrelated to the sodium emission spectrum, given that so may other mammals have similar retinas but lack fire-making skills.