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 Originally Posted by MadMojoMonkey
Sure.
I already knew that tetrachromacy was moderately common in women and not known to exist in men. I didn't know that it's rare for a person with 4 cones to have the "extra" cones be active.
Yeah, that article did a nice job explaining the fact that there is a subset of women in the 4 cone group where the extra cone is active.
On another note, we were watching the Vancouver English Bay fireworks show last night from a distance. As one would think, the light got to us very quickly but the sound waves took longer. It almost sounded like there were two explosions each time, one delayed a little bit from the light and one delayed even more.
We use one word for thunder and another for lightning but they both come from the same event. What are some other examples in the universe where we perceive things to be different when they come from the same event? I guess an obvious answer would be space-time but there are probably quite a few others...
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