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A massive, long-ago extinction was once thought to have been caused by a destructive wave of volcanic activity. Scientists now point their fingers at another culprit. A giant, deadly “Earth burp.”

Scientists are closing in on a long-sought goal: A blood test to screen people for Alzheimer's disease. An experimental test did a good job of indicating how much of the telltale Alzheimer's plaque lurks in people's brains, Australian researchers reported Wednesday. If the test proves accurate in larger studies, it could offer a way to check people having memory problems to see who needs more definitive testing for the disease.

Although many experts have long debated the role of the environment in breast cancer, the possibility that chemicals are changing how and when breasts develop is a relatively new concern for scientists.

Scientists say within a few years, a simple cheek swab could allow health experts to create individualized diet plans for people based on their ...

Scientists have discovered the deepest multicellular life, a worm species, a mile underground in a mine in South Africa, opening the door to the search for complex life in harsh places, including underground and in space.

Scientists analyzing bits of hardened lava from long-ago lunar eruptions found about as much water as in similar magmas on Earth.

Scientists thought a mysterious guinea pig-sized rodent species that hadn't been seen in 113 years was long extinct. Until one of them ambled up to two volunteer naturalists at a nature reserve in Colombia two weeks ago.

Physicist Stephen Hawking believes there is no afterlife, and that the concept of heaven is a "fairy story" for people who fear death.

After working for half a century and spending £500m, scientists last week revealed that they have detected strange fluctuations in Earth's orbit. Space-time is bent and then twisted round our planet as it rotates, announced researchers with Nasa's Gravity Probe B project.

Health risks to Japanese from eating foods contaminated with elevated levels of radiation are fairly low, scientists say.