Our single-celled ancestor lived in a world without plants, animals or oxygen-rich oceans. Yet, this seemingly simple microorganism took the first steps toward complex life. From this ancestor emerged ...

The molecular building blocks that make up the cells of humans, animals and plants so sophisticated appear to be older than scientists previously ...

In 1921, Otto Loewi woke from a dream with the idea for an experiment that proved nerves communicate using chemicals, not just electricity. By showing that stimulating one frog’s heart released a ...

The origin of the nucleus remains hotly debated among scientists, but new imaging and genomic data are shedding light on this billion-year-old mystery.