Early humans seemed to strike the perfect balance in situating their hearths in the cave, preserving ample sitting and cooking space while avoiding the worst effects of smoke.

Antibody tests may be coming soon to a pharmacy near you. Here's what the tests reveal — and don't reveal — about you and COVID-19.

Findings from a new study help answer questions about why some people get more severe and transmissible HIV than others — and serve as a reminder that viruses don't always weaken over time.

Instead of playing the same old tune, male song sparrow's sing a variety of songs to keep potential mates interested.

Science writer Florence Williams experienced what felt like a brain injury when her husband left her after more than 25 years. Her new book is Heartbreak: A Personal and Scientific Journey.

Song sparrows have a wide repertoire of tunes — and seem to be judicious about not repeating a certain song too often. Rather than sing the same playlist every time, they hit shuffle.

Microglia are amoeba-like cells that scour the brain for injuries and invaders. But sometimes the usually helpful cells go into overdrive and damage the brain, researchers say.

Common chemical elements are created in stars like our sun. But heavy elements, like iron, are thought to form in massive stars that explode and spew material — though it might be more complicated.

Scientists have shown that the brain uses multiple checkpoints to make sure we get enough water, but not too much.

The World Health Organization has created a Hub for Pandemic and Epidemic Intelligence. Dr. Chikwe Ihekweazu, who heads the group, talks about the challenges that lie ahead.