In a study published in Physics of Fluids, the researchers used the Navier-Stokes equations—the bedrock math of fluid flows—and a few experiments to investigate the behavior of thin liquid films that ...

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, ...

The knife easily leaves swirls in the spread. rimglow/iStock via Getty Images Plus Those Transportation Security Administration requirements are drilled into every frequent flyer’s head: You can carry ...