This artist's concept illustrates a Martian dust storm, which might also crackle with electricity. Disclaimer: AAAS and ...

Clouds of cosmic dust and gas contain many of the building blocks needed for life, but sulfur is mysteriously rare. One of the most common forms of sulfur is S8, a ring of sulfur atoms that form a ...

The new approach uses a purely optical technique called stimulated two-photon excitation to generate streams of photons in different polarization states directly from a quantum dot without requiring ...