If there's one thing we can all agree on, it's that riddles are undeniably fun! (Just ask the Ancient Greeks). There's nothing like the triumphant feeling one gets after solving an "unanswerable" ...

Visit Insider's homepage for more stories. Sometimes puzzles are so obvious that they're nearly impossible to solve.

We love testing our brains every day. Whether it's with a tricky puzzle, learning a new language or doing a simple sudoku (emphasis on the simple here). And one of the easiest and most fun ways to ...

Riddles are so tough, and this one is no different. It may seem simple, but you'll likely jump to the wrong conclusion - and it may just end up keeping you up all night The riddle may just keep you up ...