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A psychologist explains how group identity, polarizing issues and social media are driving people apart - and suggests some remedies.

Aligning AIs with people's goals and values is tricky. A new technique quantifies how far off human and machine are from each other.

Market swings may be rattling retirement accounts, but panic isn't the answer. Here's what to know about how 401(k) accounts work - and when to worry.

The decades-long struggle to find a permanent place to dispose of nuclear waste will continue, probably for many years to come.

Pennsylvania hospitals report an average 14% vacancy rate for registered nurses. In rural areas it is much higher.

The 1952 Immigration and Nationality Act gives ICE broad power, including the right to arrest many noncitizens. The extent of this power is now being tested.

The Epidemic Intelligence Service has been a crucial tool in fighting diseases at home and abroad. Its impact would be impossible to replace.

To really compare different electricity sources, you also have to look at the roles they play in keeping the lights on and their drawbacks.

Trump's tariffs may hurt, but this time China holds more cards and could turn the pressure into a strategic advantage.

Researchers reexamining fossils identified telltale marks made by human ancestors cutting meat from bones. The discovery pushes back the date hominins started living in Europe by 200,000 years.