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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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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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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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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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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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Obama Taps Army General To Lead Joint Chiefs

If confirmed by the Senate, Gen. Martin Dempsey, an accomplished veteran of the Iraq war, would succeed Navy Adm. Mike Mullen as the president's top military adviser.

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