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Oumuamua marks the first time humans have seen a visitor pass through our corner of the universe — renewing discussions of the origins of life, says astrophysicist Adam Frank.

It's not the tick that causes Lyme disease, but the bacteria that live in its spit. Scientists at the Mayo Clinic have found a second bacterium capable of causing the disease in people.

People who are sad have a harder time seeing yellow and blue, an experiment finds, but they can see green and red just fine. It might have something to do with dopamine receptors in the brain.

So-called senescent cells no longer divide, but they secrete a mixture of chemicals that can trigger inflammation, which is involved in many age-related disorders. What if the cells were removed?

By standing strong against the Nazis, America became a beacon of hope to some of the world's greatest scientists — whose positive effects on American science we still feel today, says Adam Frank.

Ever since the first movie achieved cult status, fans have hotly debated whether Rick Deckard, played by Harrison Ford, is a replicant. Blade Runner 2049 leaves room for argument, says fan Adam Frank.

Vermont official Corey Chase went on a 6,000-mile road trip to fact-check the coverage claims of mobile carriers. He found that most of them are way off.

On the eve of a Democratic presidential debate, Bernie Sanders held a monster rally in Manhattan's Washington Square Park. Polls favor Hillary Clinton but Sanders has won 8 out of the last 9 contests.

Physicians at St. Joseph's Regional Medical Center say they hope treating ER patients with alternatives to opioid painkillers will serve as a model for cutting down on opioid abuse nationwide.

America's reckoning with racism has brought down statues, one state flag and one police emblem, according to the Southern Poverty Law Center — and led to the renaming of schools and other sites.