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Four Greek Cabinet ministers have resigned in opposition to austerity measures. The uncertainty has driven down the euro and led to fiery protests on the streets of Athens.

Several times in earth's history continents have collided to form supercontinents only to later break apart. Geologist Ross Mitchell discusses a new study in Nature that predicts in 50 to 200 million years time the Americas and Eurasia will collide to form a supercontinent over the Arctic.

There's been some skepticism about how much help the $25 billion package will give hard-hit homeowners. HUD Secretary Shaun Donovan says there are other remedies for those who were devastated.

NYU psychology professor Gary Marcus took up guitar at the relatively ancient age of 38, by starting with the video game Guitar Hero. Marcus shares his experiences and insights on the science of learning, which he's gathered in a new book Guitar Zero: The New Musician and the Science of Learning.

Host Michel Martin and the Barbershop guys discuss the latest person to get into hot water on Twitter. CNN contributor Roland Martin was suspended for what critics called "homophobic" comments. The guys also weigh in on a controversial Senate campaign ad that critics are calling offensive.

To make the video, NASA stitched together time-lapse footage taken with high-resolution cameras.

Reporting in Science, researchers write that an FDA-approved drug for skin cancer had surprising results in mice with Alzheimer's. The drug rapidly cleared up amyloid protein from the brain and improved cognitive function. Co-author Gary Landreth discusses the drug's potential as a therapy for Alzheimer's.

The international agreement has been controversial and caused protests worldwide. It also predates the protests in the United States over anti-piracy bills.

They may not be ready to accept GOP presidential candidate Mitt Romney's invitation to stand with him "shoulder to shoulder," but conservatives gave him a reception that at times rose to rousing at their biggest annual gathering on Friday.

Few American chefs take foraging wild foods quite as seriously as Daniel Patterson of Coi restaurant in San Francisco. At any given day, he might be cooking with California clams, lichen, coastal spinach, Monterey Cypress, and angelica root in one dish.