What well known fact do people STILL refuse to believe?

1. That a two dollar bill is real money.
   — sherlockmyballs


2. Looks matter. A lot. [Edit] Since this got pretty popular and people are replying with a lot of stupid shit: http://psycnet.apa.org/record/2000-15386-005
   — Sniveling_Cur


3. The sites you see when you Google something are different from what others see if they search for the same thing. Google builds a "user profile" and shows you sites that align with ones previously clicked on. As time goes on, this *positive reinforcement* makes you think the world agrees with your ideas more than it actually does.
   — Back2Bach






4. Success requires skill, diligence, hard work, but also - LUCK
   — mrsam12000


5. Apparently, that Puerto Rico is part of the U.S.
   — abunchofsquirrels


6. Not everybody, but a good few people, blood is red, always, it is not blue.
   — AFTER_THAT_LION_DUDE






7. We have no real evidence that GMO are bad for human health, but millions of people are terrified of them despite this. Only thing I see is crappy business practices around them.
   — Kadol


8. It's usually not the case that dreams come true if you just keep believing in them and work really hard.
   — bendude2016


9. That you can read through a post and not add the same unoriginal comment as 200 people before you. The earth is round being the most prevalent.
   — Stooby2