California condors were all but extinct a few decades ago. Their numbers are up, and they are now at the center of the controversy over lead hunting ammunition.
Ryan Kerney and a team of biologists found green algae living inside salamander embryo cells, the first cellular-level symbiosis ever seen in a vertebrate.
High-precision measurements of Earth's gravitational field by the GOCE satellite produced the most detailed mapping yet of gravity across the Earth's surface.
Japan's meteorological agency has issued a tsunami warning for a wave of up to one meter, following a strong earthquake today near the east coast of Honshu.
A new-found fossil reveals the soft body of a 500-million-year-old undersea creature. Hemichordate Galeaplumosus abilus may provide clues to the evolution of vertebrates like us.