Why does an hourglass use sand instead of water? The Granular Flow Laboratory Project explores this concept by designing a transportable display demonstrating granular vs. fluid flow. Three ...

If you’ve ever whacked the bottom of a ketchup bottle to get that tasty tomato goop flowing, you’ve put some serious physics to work. Ketchup is a non-Newtonian fluid. So are toothpaste, yogurt, ...