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
