MRI scans of older people show major differences between searchers and non-searchers. After seven hours of Internet experience, those differences disappear. Honest? Could changing the brain be this easy?

Ultralight aircraft are guiding crane chicks toward Florida wintering grounds. Dangers remain, but it’s a step ahead for Americas’ largest flying bird, once reduced to 21 animals.

Until now, getting a picture of genetic change in a tumor over time has been next to impossible. A new study reveals that cancer’s genetic tangle gets more complicated with time.

Scientists propose 9 limits on human actions: Wrecking ozone, over-using fertilizer, killing species could block key “ecosystem services.” Are there natural limits to fresh water use and pollution?

How many dead? Research and real-life experience prove that people die when drivers pick up the cellphone. Even worse: texting on the road!

Flax, the basis for linen, was spun and dyed, and lost in the mud. More than 30,000 years later, microscopic flax fibers provide the first cord in archeological history.

The ozone layer protects Earth from UV rays: Twenty-two years after a treaty to protect ozone, how is the layer doing? What has happened to the ozone hole above Antarctica?

A planet newly found in the southern sky is perilously close to its star, orbiting in less than 1 Earth day. Within 10 years, this planet may force a new understanding of star-guts.

Imitation is a social glue in human society. We like people who imitate us. We call them friend. We will even tip them better! A new study finds similar responses in monkeys…

As Earth warms, should we try huge geoengineering projects to cool the climate? Would adding iron to fertilize ocean plants withdraw enough carbon dioxide to slow warming — or backfire?