Grade school math problem leaves people dumbfounded: Can you get the correct answer in 30 seconds?

Can you solve the elementary school problem that divided the internet in less than 30 seconds? Test your might in this ...
Space.com

Ancient eyes on the skies: Early astronomers quiz

Long before modern telescopes, early astronomers mapped the heavens with math, myth, and sheer curiosity. This crossword quiz celebrates the minds who first charted the cosmos.