But the world is messier than a textbook. Scientists have sought to quantitatively describe the much more complex rolling physics of real-world objects. They have now combined theory, simulations ...

The Physics of Invisibility: Metamaterials and Cloaking Devices Metamaterials (negative refractive index) bend light around objects, creating "invisibility cloaks" (2006 Duke University breakthrough).

Researchers have detailed the physics behind a phenomenon that allows them to create spin in liquid droplets using ultrasound waves, which concentrates solid particles suspended in the liquid.