For years, a French mathematician searched for a proof that a gigantic number is prime. His method is still used 150 years ...

1, 11, 21, 1211, 111221. These are the first five elements of a number sequence. Can you figure out what comes next? If you're trying a bunch of arithmetic operations to make the numbers work, you're ...

New details on how the brain stores info, and why it's limited. WASHINGTON, Dec. 6, 2009 — -- Having a tough time recalling a phone number someone spoke a few minutes ago or forgetting items from ...

A viral number sequence puzzle challenges players to find the next number in “2, 6, 12, 20, 30, ?”. Test your analytical skills and see if you can solve it. The key here is to remain focused and keep ...

A tricky brainteaser is likely to put even the sharpest of eyes to the test. Online bingo experts at tombola have crafted a tough brainteaser that only one in four can solve. The aim of the ...