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In 2009, the city denied requests to paint crosswalks in the Pittsburgh neighborhood of Polish Hill. An unknown person has taken the law into his own hands and painted unofficial crosswalks. By coincidence, officials are also promising to install real crosswalks within a few weeks.

Cheatgrass, an invasive weed, is choking out native sagebrush in the Great Basin--and setting the stage for hotter, more catastrophic fires there. Jen Pierce, an expert on ancient fires, and Mike Pellant, of the Great Basin Restoration Initiative, talk about how fires are reshaping landscapes in the American West.

For President Obama and Mitt Romney, voter reaction to their first debate may be less about what they say and more about how they say it (and how they look, sound and gesture). That's what experts in body language, fashion, even makeup said when asked for their unsolicited advice to the candidates.

Mammoths and saber-toothed cats may be the most famous beasts of the Ice Age. But they shared the prairie with horses and camels, too--both of which evolved in North America and crossed the ice bridge into Eurasia, before disappearing here. Matthew Kohn and Christopher Hill talk about the lesser-known fauna of the Ice Age.

Angry pet owners who believe contaminated Waggin' Train chicken jerky strips killed their pets are targeting the stores that sell them. Meanwhile, the FDA says it doesn't have enough evidence to issue a recall.

An oddity of presidential politics is that candidates and their campaigns spend nearly all their time telling voters how superior they are to their rivals in virtually every area: the wisdom of their policy proposals; the soundness of their judgments — everything, really. Except for debating.

Virologists have published the genome sequence of the new coronavirus, which has killed one man and hospitalized another. The mystery virus is most closely related to coronaviruses that infect bats in Southeast Asia. But this doesn't necessarily mean that the men caught the virus directly from bats.

The story begins in the 1920s, when the U.S. government thought blimps might be the next big thing in warfare.

Steve Martin went from performing in an empty San Francisco coffee house to hosting the Oscars. In between, he spent 18 years as a stand-up comic — four of them, by his account, successful years. His early standup routines, TV specials and other TV appearances have been released in a new DVD box set.

A consulting firm hired by the Republican National Committee to register voters in five battleground states has been let go after one of its workers apparently submitted over 100 questionable registration forms in Florida's Palm Beach County.