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Theories about how animals became multicellular are shifting as researchers find greater complexity in our single-celled ancestors.
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.