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The correspondences between the artist and her friend, filmmaker Henwar Rodakiewicz — just acquired by the Library of Congress — capture her thoughts as her career takes off.

Scientists have found the first eukaryotic organism that functions fine without mitochondria, the "powerhouses" that make energy for the cells of yeast, humans and other animals.

In a press conference Monday, Chief Carl Dabadie said the deadly attack on law enforcement officers on Sunday demonstrated the need for high-powered weaponry in the hands of peace officers.

More than 70,000 deaths a year are caused by hospital-acquired infections, a CDC survey of U.S. hospitals finds. The numbers are improving, doctors say, but not fast enough.

Oprah Winfrey acquired a stake in Weight Watchers and the company's stock soared. She hopes to do the same for her cable TV network with a new seven-part series on faith and religion around the world.

When does collecting cross the line and become a disorder? And why do some people save every newspaper? Researchers Randy Frost and Gail Steketee examine compulsive hoarders in their new book, Stuff — and explain what we know about the causes of and treatments for the compulsive disorder.

According to the complaint filed this week in U.S. District Court, living conditions for families in an apartment complex in suburban Maryland include rodent infestation and toxic mold.

Before Hamas took over Gaza, agriculture was a big contributor to its economy. The U.S. hopes reviving the industry will boost not only farmers, but also security — by creating economic opportunity.

As the chief official White House photographer for President Obama, Souza sometimes shot more than 2,000 photos a day. "I was there all the time," he says. His new book is Obama: An Intimate Portrait.

Antarctica's ice is melting faster than was thought, say scientists who recently completed the most exhaustive assessment of the ice sheet to date.