What’s the Most Surprising Thing You Know?

20 Things You Didn't Know About... is consistently one of the most popular items on discovermagazine.com. Next week Discover is releasing 20 Things You Didn't Know About Everything, the book based on the column; the book comprises 20 original 20 Things... columns, much like the ones in the magazine (which also run on the site) but longer and more comprehensive. As popular as the column is, every time we publish one we get a lot of feedback that we messed up in some way and/or another—we snubbed one fact, included something that everyone knows, etc. (Sometimes the criticism gets downright malevolent.) Now that we're expanding the 20 Things... concept to the highbrow world of books, we want to make amends for any of our previous errors. We want to know—on the record, for all of the Internets to see—what we missed over.Let us know in the comments below what amazing ...