This challenging optical illusion quiz will put your eyes to the test and you have just five seconds to solve it - but how ...

This riddle dates back to 1959—can you figure out the answer?

In only its second year, the International Logic Olympiad is already booming as logic becomes more and more crucial in our ...

Take a quiz for kids of all ages and test your knowledge on Independence Day history.

Coffee break Like these emoji riddles, logic puzzles will test your smarts and keep you guessing. Emoji riddle: Yucky ...

Use BBC.com or the new BBC App to listen to BBC podcasts, Radio 4 and the World Service outside the UK. Find out how to listen to other BBC stations ...

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