Oooh, ooh, I know the answer to #11!
Yes.
However, it is an optical illusion caused by contrast with the other 358 days of the year that are overcast. It's like when you take yellow-tinted sunglasses off and everything looks strange.
In a probably-unrelated statistic, more sunglasses are sold per capita in Seattle than anywhere else. My theory is that on the rare occasions when we need them we've forgotten where we put them. But during the brief period between leaving the house and rushing to the nearest store to buy sunglasses, nearly everyone points upward and exclaims "look! holy sh*t, the sky is BLUE!".