What shapes are made by a spinning needle? This seemingly innocent problem has puzzled mathematicians for decades, but now a ...

In 1907, the English author and mathematician Henry Ernest Dudeney posed a puzzle: Can any equilateral triangle be cut into ...

Hyaluronic acid helps retain skin moisture, so most people use it after washing their face. Learn how to use hyaluronic acid with sunscreen and lotions.

As a fashion maven, Sydney Sweeney can teach a masterclass on buzzy aesthetics and how to style them. With her sartorial ...