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Feb
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comment Why do men have nipples?
This is interesting: are there any documented instances of males (in any mammalian species) actually providing nutrition to their young this way? Don't get me wrong; I certainly don't want to oppress men by suggesting that they shouldn't breastfeed if they want to, I've just never heard of them doing it. Maybe a question for SE.Parenting?
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asked Color perception vs shade perception demo
Nov
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comment Could we transmit smells electronically?
one question: just how specifically can one stimulate those receptors. The fact that any wavelength of light stimulates all three photoreceptors to some degree has the interesting consequence that it's impossible to mimic the full color space with 3 primary colors. I wonder if scents would have a similar limitation.
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comment Would oxygen levels be stable without photosynthesis?
Also, maybe worth clarifying what "the entire organic carbon reservoir" is referring to. I'm assuming it means all life on earth, plus all fossil fuels we could conceivably dig up.
Sep
21
comment Would oxygen levels be stable without photosynthesis?
So basically Unger's claim is based around the ideas in third reference (The last link is worth a read): carbon is the limiting reagent in the C + O2 -> CO2 reaction? My gut reaction is that in the absence of photosynthesis we don't live in a bistable system: we'd eventually return to the state from billions of years ago. But I can believe that initially there would be very little change.
Sep
20
revised Would oxygen levels be stable without photosynthesis?
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revised Would oxygen levels be stable without photosynthesis?
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revised Would oxygen levels be stable without photosynthesis?
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asked Would oxygen levels be stable without photosynthesis?
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