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Bad health habits are leading to chronic diseases that kill 9 out of 10 in U.S.

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The nationally-syndicated "Dr.

Laughing with friends releases feel-good brain chemicals, which also relieve pain, new research indicates. Until now, scientists haven't proven that like exercise and other activities, laughing causes a release of so-called endorphins.

Joshua and Jacob Spates - rare even among conjoined twins - recuperating in Memphis hospital

Little Joshua and Jacob Spates recovering after grueling 13-hour operation

Become part of a social-networking effort to understand and fight viral threats [More]

Dear EarthTalk : Are as many cats and dogs being euthanized these days as back in the 1970s and 1980s when indiscriminate breeding led to explosions in pet populations? -- Mary H., Knoxville, Tenn. The Humane Society of the United States (HSUS), the leading non-profit devoted to animal welfare, reports that in the 1970s American shelters euthanized between 12 and 20 million cats and dogs every year at a time when there were 67 million pets in U.S

Author Dr. Logan Levkoff and relationship expert Matt Titus debate two new studies that reveal a biological reason for an increased sensitivity in fathers.

Four Seasons Hotels and Resorts officials say they've secured financing to build a $360 million (euro264 million) resort at Walt Disney World in Florida.

World population on brink of 7 billion, but birth rates are down in some countries

So-called GDL laws tied to lower fatal accidents among young teen motorists but higher rates among older teens

CDC warning advises high-risk people to not eat cantaloupes from Rocky Ford region, Colorado

British researchers say the muscular exertion involved in laughing triggers an increase of endorphins in the brain, making it enjoyable. Jeff Glor reports

By Ed Yong of Nature magazine The iconic Nile crocodile actually comprises two different species -- and they are only distantly related.