For ages 12 and older. How many grains of sand would it take to fill the universe? This is a problem that the Greek mathematician Archimedes tried to solve in the third century B.C. In this ...

Their mission? To create a dul-tson-kyil-khor, or mandala of colored powders (commonly referred to in English as a sand mandala), over the course of five days. Constructing one of these intricate ...