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A report from doctors in Argentina raises the possibility that a mosquito pesticide could be responsible for an increase in microcephaly in Brazil. But many top scientists strongly disagree.

The Reuben H. Fleet Science Center announced Thursday it will take over the flagship programs of a science education nonprofit that's ceasing operations at the end of this month.

In rare but tricky cases, disposing of an explosive device requires removing it safely from a living person. Military doctors have ways to minimize the risks, but there's no way to eliminate them.

Women report more bad side effects from medicines than men do. Researchers say the discrepancy may stem in part from how biomedical research is conducted at its earliest stages in animals.

For decades, Zika was considered a mild virus that rarely made people ill. Suddenly it seems to be causing serious problems and is spreading across the Americas. Here's the latest news.

The San Diego Unified School District Board of Education voted Tuesday night to appoint a replacement for Marne Foster, who resigned last week after pleading guilty to a misdemeanor.

It's not the tick that causes Lyme disease, but the bacteria that live in its spit. Scientists at the Mayo Clinic have found a second bacterium capable of causing the disease in people.

A series of fake campaign posters locking Bernie Sanders and Hillary Clinton was just supposed to be funny, said the meme's creator. Except a lot of people thought it was sexist.

Republican establishment choice Jeb Bush was once the candidate to beat. No more: Ted Cruz, Donald Trump and Marco Rubio's success in the Iowa caucuses puts new pressure on the party mainstream.

The CDC reported the first case of sexually transmitted Zika virus in the U.S. related to the current outbreak. It's happened before. Here's what we know about how the virus could move between people.