From a world shaped like a giant donut to a planet with the sharp edges of a perfect cube, changing the shape of Earth would ...

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

This 180-sided object cannot fit through another like it, no matter where you bore the hole or how you tilt it.

When most people think of shapes, they imagine a triangle, a rectangle, or maybe even a fancier- sounding rhombus or trapezoid. But to mathematicians, shapes encompass a vast universe of surprising ...

It’s a tight squeeze: If you make the second cube just 4% larger, it will no longer fit. It’s natural to wonder which other ...

The shade: Those with medium length nails “have no boundaries” color-wise, says Stone. Go wild with your shade pick.

A tetrahedron is the simplest Platonic solid. Mathematicians have now made one that’s stable only on one side, confirming a decades-old conjecture. In 360 BCE, Plato envisioned the cosmos as an ...