The S&P 500 dipped Friday. As Fred Katayama reports, energy and telecom stocks led the broad-based decline.

The virulent bacteria MRSA flourishes in locker rooms, on gear and on players’ skin, and the fight to prevent infections includes high-tech solutions like a chemical fog.

The winner of the 2017 Nobel Peace Prize is the International Campaign to Abolish Nuclear Weapons. ICAN received the award for its role in achieving the Treaty on the Prohibition of Nuclear Weapons.

In a way reminiscent of the early days of West Africa’s Ebola outbreak, a disease that is normally rural has reached cities and is spreading rapidly.

President Donald Trump promised to build a wall on the U.S.-Mexico border. Six companies have been selected to build eight prototypes of the wall.

The Trump administration is altering Obamacare’s controversial contraceptive mandate, potentially allowing employers leeway to withhold birth control coverage on religious grounds. CNN’s Kaitlan Collins reports.