The Great Pyramid of Giza, the oldest and sole surviving Wonder of the Ancient World, has attracted the interest of philosophers, savants, and travelers for at least four millennia. Some of this ...

The superstitious numbers 13 and 18 both have a long history reaching back millennia. The first is usually regarded as unlucky, the latter, lucky – but why? What are the actual origins of these ...

Can you drill a hole in a cube that an identical cube could fall through? Prince Rupert of the Rhine first asked this ...

"The kid starts cackling, and I realise he invented his own question in order to trick me into saying it," the teacher wrote.

To see how one cube can pass through another, imagine holding a cube over a table and examining its shadow (assuming it’s ...