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Many things raise the risk for cancer, including exposure to various toxins and radiation. But our knowledge about the range of chemicals and compounds that can trigger cancer is limited.

Kayla Mueller, 26, has been confirmed dead by her parents and the White House. She had been held by Islamic State militants since 2013. Friends gathered in Prescott, Ariz., to remember her.

Craig Stephen Hicks, who turned himself in, was charged with first-degree murder. The police chief said the department would investigate whether the crime was "hate-motivated."

In the Hubble image of a galaxy cluster, two bright galaxies resemble eyes, NASA says, "and the misleading smile lines are actually arcs caused by an effect known as strong gravitational lensing."

The European Space Agency probe has sent a new image of Comet 67P/Churyumov–Gerasimenko from about 77 miles away.

Captain Francesco Schettino was sentenced to 16 years in prison for his role in the disaster, in which an Italian cruise ship hit rocks in 2012 and sank, killing 32 people.

Oregon Secretary of State Kate Brown launched a wave of speculation in the state capitol Wednesday by abruptly leaving a conference she was attending in...

Lynsey Addario was taken captive in 2011 while covering Libya's civil war. With a gun to her head, she says, she was thinking, "Will I ever get my cameras back?"

George Washington drank hot chocolate for breakfast, according to historians. But his version was flavored with chili powder, vanilla and allspice, and contained less sugar than the cocoa of today.

When Jon Stewart announced on Tuesday that he is leaving the host chair of The Daily Show on Comedy Central later this year, he prompted great dismay among his many fans. The show has influenced a generation of young people — especially liberals and Democrats — and changed how they view both the news and politics.