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People who are 50 and older and certain immunocompromised individuals may get a second Pfizer-BioNTech or Moderna COVID-19 vaccine booster four months after they received the first.

SpaceX launched three rich businessmen — American, Canadian and Israeli — and their astronaut escort to the International Space Station for more than a week's stay.

Tuesday's top race is in Ohio, where voters are set to pick nominees for an open U.S. Senate seat. Redistricting has also affected some of the state's closely watched House races.

A new study based on thousands of DNA sequences and owner surveys finds that less than 10% of a dog's behavior — like howling, herding or retrieving — can be explained by its breed.

Warming temperatures are forcing Antarctic penguins to breed earlier and that's a big problem for two of the cute tuxedoed species that face extinction by the end of the century, a study said.

Donald Trump held a press conference Tuesday to address questions about charitable donations he claimed to make in support of military veterans.

For Navy Lt. Mark Radlinski, coming home from Iraq was both the best and worst day. But his brother had no mixed emotions — it was all positive. When Felicia Banks deployed with the Army, her children were not as aware of what was going on. They knew they were thrilled to have her back, though.

These days hospitals drill for mass casualty disasters like the explosions at Monday's Boston Marathon. But when it happened for real, the first response was disbelief. Then the victims began arriving. Doctors say they were confronted with the kinds of IED injuries that U.S. troops have gotten in Iraq and Afghanistan.

The White House tapped former Justice Department lawyer Christopher Wray after a drawn-out search to replace James Comey when he was fired abruptly at the beginning of May.

Rachel Martin talks to Jim Marinitti of the National Air Traffic Controller Association about how the partial government shutdown affects aviation security.