You know John Glenn was the first American to orbit the Earth--his Mercury capsule circled the Earth three times before splashing down in the Atlantic Ocean. But who was the second U.S. astronaut to orbit the Earth? Don't know? Don't worry--you'll find out in HuffPost Science's debut "This Week In Science History" slideshow.
And that's not the only fascinating thing in the slideshow. You'll read about a 12-year-old boy who made medical history...about the world's first-ever text message...the first humans to reach the stratosphere...and much more.
What are you waiting for? Click through for a fun way to raise your scientific I.Q.