A stroll on the beach can mean sinking your toes into smooth sand or walking firm-footed on a surface that appears almost solid. While both properties are commonplace, exactly what it is that makes ...

Did you eat cereal this morning? Or have you walked on a gravel path? Maybe you had a headache and had to take a pill? If you answered any of these questions with a yes, you interacted with a granular ...

Pour sand from a bucket and it flows like a liquid, but stand on it and it supports weight like a solid. This unusual behavior is a property of granular materials, and it is one of the reasons ...