Plurib.us

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The last several days have seen three ideas shattered (for me), that I used to take as obvious truths.  (Now it is your turn.)

Graduated color-sensitivity of our peripheral vision:
xkcd.com/1080/

Night Glow (bonus: other crazy things about our atmosphere):
auroranightglow.blogspot.com/2012/05/good-p...
auroranightglow.blogspot.com/2012/05/night-...

Lunar Libration (in which we can see 59% of the Moon's surface from Earth):
en.wikipedia.org/wiki/Libration
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