Scientists have created a virtual arm that monkeys can move with their thoughts--and the arm can send information back to the brain about the textures of what it touches. Neuroscientist Miguel Nicolelis talks about how this may lead to a full-body suit that helps paralyzed people move and walk again.

In 1998, two teams of physicists looking at distant supernovae noticed something surprising--the supernovae were not only moving outwards but also accelerating. These observations have won three Americans the 2011 Nobel Prize in physics. Nobelist Adam Riess discusses how physicists are now looking at the universe.

Considering the Norway shootings, drug wars in Mexico and ongoing conflicts in the Middle East, this era may seem as violent as any. But as Harvard psychologist Steven Pinker argues in his book The Better Angels of Our Nature, this may actually be the most peaceable period in human history.

Opportunity, one of two rovers launched in 2003, has traversed thirteen miles in the three years it's been on Mars. It's now at the lip of a 14-mile-wide crater named Endeavour. Project leader Steve Squyres discusses the rover's findings and what NASA hopes to learn.

The greenhouse gas emissions from the 55 million tons of food the U.S. food wastes every year add up to to 135 million tons a year. Some foods, like beef, have a much bigger impact on the climate than others.

Guy Raz talks to Joseph Alonso, head stonemason at the Washington National Cathedral, about the damage the building suffered from the Aug. 23 earthquake.

Even though the FDA started allowing makers of foods containing barley and oats to advertise how good they are for the heart a few years back, demand for the crops is still relatively low. We seem to like our meat and potatoes better.

The 2011 British Wildlife Photography Awards feature the U.K.'s resident animals as they roam their terrain and swim in their waters.