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A pair of mammoth skeletons is found locked together by their tusks. What happened?

Even so-called "mild" head injuries turn out to be anything but.

Once scorned for his ideas about how cancer grows, the late Judah Folkman is now hailed as a visionary.

In this excerpt from a 2002 commencement address at Oberlin College, the late cancer researcher Judah Folkman describes how he learned to think outside the box when he was in high school. Listen in.

NASA's latest robot has already found frozen water and is looking for more signs that the Red Planet could support life.

Meet a marine biologist and explorer who has engineered new ways to spy on deep-sea creatures.

Astronomers have their radio telescopes tuned to receive signals from alien worlds. But is anybody out there?

Three separate teams overcome a biomedical hurdle -- creating stem cells without the use of human embryos.

A century after falling out of favor among doctors, medicinal leeches are back in hospitals, sucking away on patients' wounds.

Clues to the origins of human language are turning up in the brains of birds.