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Dec
29
comment Why didn't the polar bear change its color from white to black during evolution to absorb heat?
@Chris - The amount of energy in UV is utterly negligible compared to the bear's metabolism. See for instance en.wikipedia.org/wiki/Ultraviolet_index (where you get numbers of under a watt per square meter even at noon in the tropics). It might be useful for vitamin D production (if bears need it), but not for warmth.
Sep
16
awarded  Critic
May
13
awarded  Yearling
May
12
awarded  Editor
May
12
revised Is RGB diode lighting okay for the eyes?
added 93 characters in body
May
12
awarded  Teacher
May
12
answered Are there neuronal firing artifacts produced by head movement?
May
12
answered Is RGB diode lighting okay for the eyes?
May
12
answered DNA replication Okazaki fragments
May
12
answered Is it possible to print humans?
Nov
1
comment Can Bioluminescence drive photosynthesis?
@shigeta - Refrigerators are reasonably efficient air conditioners. The key is not how much energy you expend, it's the configuration of the heat cycle (i.e. cooling coils and open door not in the same room if you want to reduce the mean temperature in one room). It's really not analogous at all--here the issue is that you need the methane processed, and providing light input (and methane as the carbon source) is one way to accomplish it.
Nov
1
comment Can Bioluminescence drive photosynthesis?
@shigeta - No, opening a refrigerator in the kitchen can only warm the kitchen. The more energy you put in, the warmer it will get. You can cool the kitchen if you put the refrigerator half in the kitchen and half in some other room (or outside).
Apr
4
awarded  Supporter