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

What comes once in a minute, twice in a moment, but never in a thousand years? The letter "M." Visit Insider's homepage for more stories. Sometimes puzzles are so obvious that they're nearly ...

Answer: A quarter and a nickel. The statement said only one of the coins wasn’t a nickel. Try to solve these math riddles to really give your brain a workout.

Riddles‍‌‍‍‌‍‌‍‍‌ are one of the best ways to make learning interesting. They develop kids' curiosity, require creative thinking, and make for a great, fun activity to spend time with your kids.

Here’s your chance to warm up your thinking powers with 12 brainteasers and riddles organized from simple to difficult. Ready the stopwatch app on your phone. Readers who can get eight or more items ...