After a sperm fertilizes an egg, cells divide in a stage called a blastocyst. Doctors say pregnancy doesn't start until the blastocyst implants into the woman's uterus. iStockphoto.com hide caption

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Abortion Foes Push To Redefine Personhood

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Weiner Denies Sending Lewd Photo

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Potential Presidential Hopefuls Head To N.H.

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Texas Scrambles To Redistrict Lone Star State

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House Speaker John Boehner speaks to the media Wednesday after meeting with the president about the debt limit. "We know what the problems are — let's not kick the can down the road one more time," he said. Saul Loeb/AFP/Getty Images hide caption

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Saul Loeb/AFP/Getty Images

Obama, House GOP Talk Debt; Neither Side Blinks

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Obama Nominates Bryson For Commerce Secretary

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House Rejects Debt Limit Increase Without Cuts

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What Does The Head Of The Joint Chiefs Of Staff Do?

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Former Alaska Gov. Sarah Palin, center, visits a Civil War-era cemetery, Tuesday, May 31, 2011, at Gettysburg National Military Park. Timothy Jacobsen/AP hide caption

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Timothy Jacobsen/AP

Asma Jehangir, a human rights advocate and lawyer in Lahore, Pakistan, is an outspoken critic of the military. Jim Wildman/NPR hide caption

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Jim Wildman/NPR

Criticizing Pakistan's Military: Dangerous, As Is Life

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Army Chief of Staff Gen. Martin Dempsey pauses before speaking to family members of fallen service members at a Tragedy Assistance Program for Survivors seminar. Evan Vucci/AP hide caption

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Evan Vucci/AP

Obama Taps Army General To Lead Joint Chiefs

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Obama Taps Army Leader As New Joint Chiefs Head

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