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 ...

For one billion people living in coastal areas around the world, these sand grains also defend against intense storms and sea level rise fueled by climate change. Coastal beaches and dunes act ...

And desert sand, like ocean waves, rolls and bounces. And these self-organizing individual grains create ever-shifting wave-shaped ripples on the dune’s surface. And human hands form images that ...