Hari interviews MIT's Shep Doeleman on plans to capture the first-ever black hole image.

As pro-government forces in Iran try to quell protests over last week's disputed presidential election, supporters of reform candidate Mir Hossein Mousavi are taking their fight to social networking sites, such as Facebook and Twitter, reports Lindsey Hilsum of ITN…

Roger Rosenblatt takes a look at last year's Kentucky Derby winner, Barbaro, who recently died.