Defying gravity with the Brazil nut effect

Physicists from the University of Utrecht and the Faculty of Physics at the University of Warsaw have observed—for the first time experimentally—the Brazil nut effect in a mixture of charged colloidal particles.

Unwinding the world's smallest biological rotary motor by degrees

Adenosine triphosphate (ATP) is the energy currency of cells. It powers various cellular processes that require energy, including enzymatic reactions. ATP is synthesized with the help of an enzyme complex called F-type ATP ...

A surprising way to trap a microparticle

When physicists recently steered a tiny microparticle toward a cylindrical obstacle, they expected one of two outcomes to occur. The particle would either collide into the obstacle or sail around it. The particle, however, ...

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