17Entry by AsherNitin
16Entry by theghostofcarl
You would think that commonly-stated facts earned that status because, you know, they're valid statements backed by proven data. But, as with many things we tend to accept wholesale, it turns out many of these "facts" are pretty much bullshit.
(Shout out to Dwayne Hoover for the contest suggestion. Celebrate by eating all the cake you desire.)