For nearly a century, scientists around the world have been searching for dark matter—an invisible substance believed to make ...

Measuring the relative abundances of heavy stable isotopes of the elements C, H, N, and O in proteins is of interest in environmental science, archeology, zoology, medicine, and other fields. The ...

As summer kicks into full gear and people are spending more time outside, there's one thing on many people's minds—ticks.

An attosecond—or 0.000000000000000001 second—is no time at all for a person. That is not so for electrons, atoms and ...