Fossils of a new species discovered in China suggest birds developed 6 million years earlier than previously thought.

Researchers use the genome-editing tool to manipulate cultured human endothelial cells.

High-speed X-ray video reveals how bombardier beetles control their toxic sprays.

An immune protein previously thought to mark inactive T cells has a free-floating form that correlates with HIV disease progression.

Early HIV/AIDS posters raised awareness about the disease and later encouraged behavioral changes to prevent its spread.

Sequencing HIV integration sites suggests that clonally expanded T-cell populations may not be the main source of latent virus.

From diagnostics to vaccines, llama antibodies point to new directions in HIV research.

Meet some of the people featured in the May 2015 issue of The Scientist.

Three studies identify roles for N6-methyladenosine in algae, worms, and flies.

Physics drove the convergent evolution of swimming in 22 unrelated marine species, a study suggests.

Researchers identify a neural circuit that controls feelings of fullness in mice.

Readers reveal research mishaps