A century-old thought experiment on wave–particle duality is brought into the laboratory using a single trapped atom ...

The Einstein–de Haas effect, which links the spin of electrons to macroscopic rotation, has now been demonstrated in a ...

For more than a century, modern physics has rested on two towering frameworks that do not quite agree with each other.

In an effort to bring together the domains of gravity and quantum theory, Albert Einstein and Nathan Rosen proposed a ...

For more than a century, the double-slit experiment has been the sharpest test of what reality is made of, and of whether Albert Einstein or Niels Bohr had the better grasp of the quantum world. Now a ...

Einstein’s claim that the speed of light is constant has survived more than a century of scrutiny—but scientists are still daring to test it. Some theories of quantum gravity suggest light might ...

For those who watch gravitational waves roll in from the universe, GW250114 is a big one. It's the clearest gravitational ...

This puzzle is known as the problem of time, and it remains one of the most persistent obstacles to a unified theory of ...

His explicit goal of ‘creating superhumans’ places him at the center of a debate that usually involves seasoned scientists ...