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President Obama, the first lady and vice president gathered for a moment of silence at the White House. Other ceremonies are scheduled at the Pentagon, in New York and in Shanksville, Pa.

They were married in South Africa. The next day, he told his bride he was HIV positive. Soon after, she tested positive. And she thought nothing in her life would ever go right.

Irina Bokova, director-general of UNESCO in Paris, calls for international help to protect Iraq's schoolchildren as they return to school.

NASA says that a ban on CFCs enacted in the 1980s has contributed to a 4 percent rebound since 2000 in atmospheric ozone in mid-northern latitudes.

In many countries, eggs aren't refrigerated and they're still considered safe to eat. But in the U.S., we have to chill them, because we've washed away the cuticle that protects them from bacteria.

The House speaker said Congress "ought to give the president what he's asking for" but also expressed skepticism, saying the White House plan to defeat Islamic State militants doesn't go far enough.

For those who think there are not enough hours in the day, researchers may have just offered you a solution. The brain can continue tasks even while asleep, a study finds. Texting not included, alas.

Some say our military has a big role to play in bringing Ebola under control. But sending in troops is trickier than it sounds.

The rare virus is spreading fast, and doctors don't have an instant test to find out who has it. So parents should be ready to seek help quickly if a child has a cold that's rapidly getting worse.

In an interview with NPR, the national security adviser said the U.S. will not be drawn into a ground war in Iraq and Syria, even if local forces are insufficient at containing the Sunni militants.