Add Yahoo as a preferred source to see more of our stories on Google. Galileo, holding two balls, about to perform his legendary experiment. Hulton Archive/Stringer via Getty Images If you drop a ...

Dark matter is an elusive form of matter that almost never emits, absorbs or reflects light, while only weakly interacting ...

For more than 60 years, Bell's theorem has been the gold standard for demonstrating that quantum mechanics defies the rules ...

Explicit learning goals Interactive lectures Transformed homework problems (including a "bank" of potential HW problems) Common student difficulties & in-class group activities/tutorials Concept tests ...

Exploring cause and effect A photo of the Sagnac interferometer used to generate polarization-entangled photon pairs during a basis measurement. (Courtesy: Davide Poderini/Sapienza University of Rome) ...

Exotic paths: artist's impression of the microwave triple-slot experiment. Courtesy: G Rengaraj et al/New Journal of Physics) The importance of including exotic “non-classical paths” in analyses of ...

In 1971, graduate student Stuart Freedman and postdoctoral fellow John Clauser took over a room in the sub-basement of Birge Hall at the University of California, Berkeley, and built an experiment ...

Researchers have developed creative tactics to get rid of loopholes that have long confounded tests of quantum mechanics. With their innovative method, the researchers were able to demonstrate quantum ...