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A bill passed last week by Arizona lawmakers would have allowed business owners to refuse service to gays and lesbians on the basis of religious beliefs. Gov. Jan Brewer vetoed the bill on Wednesday.

Researchers say they can replace DNA in human eggs with genetic material from another woman to prevent devastating disorders in children. But big questions remain on safety and ethics.

Iowa's ban on nearly all abortions as early as six weeks of pregnancy takes effect on Monday. Iowa joins 17 other states that restrict abortions then or earlier.

The winged mammal has a unique ability to carry viruses and not get sick from them. This tolerance may be a unique adaptation to flying.

At least 11 cases of the viral disease are linked to a British man's ski trip to the Alps after attending a conference in Singapore.

Tennessee is caught in a vicious cycle: Fear of gun crime in traffic has caused more people to carry guns in their cars, which has created a new supply of stolen guns for criminals.

Here's another good reason to keep exercising. A study finds people with obesity who exercise can store more fat under the skin instead of around their organs, which is much better for their health.

Researchers in Seattle have created a public observatory for studying the visual circuitry in a mouse's brain. Among the attractions: watching 18,000 neurons respond to Orson Welles' Touch of Evil.

While many modern plants use colorful flowers to attract pollinators, ancient palm-like plants called cycads lure them by heating up and glowing in the infrared.

And they're not unplugging from email and text messages when they do get away, an NPR poll finds. "So they're taking their stress along with them wherever they go," says a Harvard scientist.