Can you drill a hole in a cube that an identical cube could fall through? Prince Rupert of the Rhine first asked this question in the 17th century, and he soon found out the answer is yes. One can ...

Titch and Ted learn about geometry on their day out at the beach. Titch and Ted have had a lovely day at the beach, solving problems with 2D and 3D shapes and using the vocabulary of directions, ...

"Hearst Magazines and Yahoo may earn commission or revenue on some items through these links." When 2D puzzles are no longer exciting, 3D brain teasers are the way. These handheld puzzles require ...