Biology

Researchers struggle to incorporate ongoing evolutionary discoveries into an animal classification scheme older than Darwin.

Contrary to popular belief, bacteria have organelles too. Scientists are now studying them for insights into how complex cells evolved.

New experimental results simultaneously advance and challenge the theory that the brain’s network of neurons balances on the knife-edge between two phases.

Immunologists confirm an old hunch: T-cells identify what belongs in the body by timing how long they can bind to it.

Viruses and other parasites may sync with their host’s biological clock — or reset it — to gain an advantage.

Surviving fragments of genetic material preserved in sediments allow scientists to see the full diversity of past life — even microbes.

Some viruses can replicate without infecting any one cell with all their genes.

For more than six decades, the influential biologist Edward O. Wilson has drawn connections between evolution, ecology and behavior, often sparking controversies inside and outside of science.

Skyrocketing animal diversity a half-billion years ago was linked to spikes and dips in marine oxygen levels, according to a detailed geological study.