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Scientists have known for decades that nicotine decreases appetite among smokers, but they didn't know why. It turns out that nicotine activates a pathway in the brain that suppresses appetite, a new study finds.

Where is climate change currently happening on Earth, and what's causing those changes to occur? We speak to a physicist from the Jet Propulsion Laboratory about where major climate changes are taking place, and how climate modeling helps to predict future changes in our atmosphere.

Paula Felix-Didier of the Museo del Cine in Buenos Aires, Argentina, discovered more than 20 minutes of missing film footage from the classic science fiction silent movie Metropolis in her museum's archives. German filmmaker Fritz Lang directed the film, and three reels have been missing almost since its premiere in 1927.

Newt Gingrich rose to prominence as the leader of the 1994 Republican revolution, in which the GOP took back the House majority after 40 years in the wilderness. During his reign, Congress forced a government shutdown, overhauled the welfare system, balanced the budget for the first time in decades and impeached the president.

A drilling boom in Pennsylvania is helping the economies of Rust Belt cities long accustomed to bad news. Drilling requires lots of steel and that has manufacturers expanding and hiring new workers.

It's been 40 years since humans first stepped onto the surface of moon. What's next in space exploration? Some scientists have their sights set on Mars.

Egypt is set to start rewriting its constitution in March, a year after the fall of president Hosni Mubarak in February 2011. During a visit to Egypt, Justice Ruth Bader Ginsburg said she "would not look to the U.S. Constitution if I were drafting a constitution in the year 2012."

On July 1st , California will be the first state in the nation to ban foie gras, which is the fatty liver of a duck or goose. It’s being banned because of the way it’s harvested, which some say is cruel to the animals. Here in San Diego, animal rights activists are declaring victory while chefs and foodies cringe in horror.

Scientists are racing to genetically engineer strains of rice that can prevent the deadly famines that come with drought and floods in Asia. One new strain causes part of the plant to elongate, acting as a snorkel.

Professors of computational media at Georgia Tech say that gaming technology can be used to make advancements in everything from medicine to social justice and media. The school is one of 250 colleges and universities that are catering to the growing interest in gaming degrees.