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Girls in the U.S. are getting their first menstrual period about 6 months earlier on average than they did in the 1950s and '60s. And the number of girls starting their period before age nine has doubled. Researchers say parents can help prepare their kids for early puberty.

Plastic particles are found in our organs, blood and even semen. But do they stay in us forever? What damage are they doing? Here are six questions scientists are trying to answer.

A few cats have died from bird flu after eating raw food. And some raw pet food products have been recalled. Here's what to know about the risks to your fur babies, and how to keep them safe.

If the season or an injury has derailed your gym routine, don't sweat it. New research shows your muscles can regain lost strength faster than you might think.

The National Nuclear Security Administration is a semi-autonomous agency within the Department of Energy that oversees the U.S. stockpile of thousands of nuclear weapons. Officials were given hours to fire hundreds of employees.