A simple-looking math problem has confused people for years. Here's the answer and the reasoning behind it—that settles the ...

The bat-and-ball problem is a famous math puzzle that more than half of people—even Harvard graduates—get wrong. It's ...

The result is correct but challenges core norms of mathematics: checking proofs, crediting ideas and keeping research open to ...

Get your timer out and see whether you can remember the golden rule from grade school math class.