The diamond will be cut, polished, sent on a worldwide tour and then sold later this year.

The U.S. Food and Drug Administration has questions about the safety and legality of AeroShot, the inhalable caffeine product released last month. So does the American Academy of Pediatrics.

California patients and doctors had sued to block the state's decision to cut Medicaid payment rates. But instead of ruling on the matter, the U.S. Supreme Court sent the case back to a lower court, saying "changed circumstances" in the case warrant a different process for deciding it.

At the groundbreaking on the National Mall on Wednesday, President Obama said the newest Smithsonian museum has been has "a long time coming" and will serve "not just as a record of tragedy, but as a celebration of life." The National Museum of African American History and Culture is expected to open in 2015.

The mailings follow letters to comedians Stephen Colbert and Jon Stewart that warned of the mailings.

A GPS error could have affected an Italian team's observations that neutrinos moved faster than light. It was a finding that threatened the very basics of physics.

Jeh Johnson said there's no difference between today's high-tech strikes and past actions like targeting an airplane carrying the commander of the Japanese Navy in 1943.

An expert panel is expanding an earlier recommendation that seniors be vaccinated if they have contact with very young infants. Now just about all seniors will be candidates for vaccination. Adults and teens have been on the recommended list for years already.

Priorities USA Action has unveiled a new ad in Michigan in advance of that state's GOP primary next week. It takes former Massachusetts Gov. Mitt Romney to task for opposing the auto industry bailout.

The International Atomic Energy Agency said Iran refused its team access to a military site at Parchin.