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Alex Longo hopes to be the first person to walk on Mars. In the meantime, the Raleigh, N.C., sophomore has suggested a landing site for the next rover mission. His pick is one of four finalists.

Many combatants return from the battlefield with hearing loss. The U.S. Army has begun deploying a "smart earplug" system that can protect hearing without blocking crucial sounds.

Paul Nehlen, who is challenging Paul Ryan in the Wisconsin primary, defended Donald Trump's criticism of Muslim dad and attorney Khizr Khan.

The recent hacking of Democratic Party emails has raised questions about the vulnerability of other election-related technology and what potential problems could arise on Election Day.

Cataracts are the No. 1 cause of blindness. In the West, a simple surgery can reverse the vision loss. An HBO documentary looks at the effort to do the same for people in the developing world.

A new exhibit at the Baltimore Museum of Art shows how the Maasai and other cultures transform bowls, belts and shields into objects of beauty.

Donald Trump and Mike Pence make their first joint campaign appearances since accepting the Republican nominations for president and vice president, with events Monday in Virginia and North Carolina.

Hillary Clinton flew with the president on Air Force One to North Carolina. "Everybody can tweet," Obama said. "But nobody actually knows what it takes to do the job until you've sat behind the desk."

A third of hospitals surveyed in low- and middle-income countries report they do not have running water all the time. And sometimes not at all.

Scientists are making impressive progress in creating a vaccine for Zika. And they're using a new technology that makes vaccine development faster than ever.