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Doctors have been decoding our pee and poo since medieval times. They even have handy visual guides.

Republican presidential candidate Mitt Romney on Thursday revealed a bit more about his tax history, telling reporters: "I never paid less than 13 percent" in the past 10 years. The Obama campaign's response: "Prove it."

Forests on the island of Guam are experiencing a spider epidemic, and invasive brown tree snakes are to blame. The snakes have nearly obliterated the island's native forest birds — which used to keep spider numbers in check.

The U.S. women's gymnastics team has won the team gold medal at the London 2012 Olympics, handily beating Russia, which took silver, and Romania, which took bronze. China finished fourth.

There are more than 1,400 billionaires in the world right now, according to two sources — one in the U.S., and one in China. But the tallies by Forbes and Hurun Report differ on key points, including whether there are now more billionaires in Asia than anywhere else.

Democrats on the Senate Intelligence Committee are pressing for the release of a so-called torture report on Bush-era interrogation practices. But there are several hurdles to clear before portions of the report might become declassified.

For the second day, General Motors CEO Mary Barra faced tough questions from Congress about how her company responded to defects that contributed to at least 13 deaths.

A pro-Russian group is one of several that have seized public government buildings in the past week. Ukrainian officials promise a "very tough" response.

Beginning with Nixon, he served three presidents in Cabinet-level positions and was regarded as a "hawkish and erudite" thinker on economics and national security. Schlesinger was 85.

Aroldis Chapman suffered fractures above his eye and nose, but only a mild concussion and no brain injury. The All-Star will have a plate inserted into his head and should return this season.