AXT Inc.’s ties to a Chinese defense firm highlight the broader challenge of preventing U.S. technology and know-how from ending up in the hands of China’s military.

Planetary Technologies, a Canadian startup, is attempting to use an antacid powder to make the ocean recycle more carbon dioxide from the atmosphere.

The smuggling of monkeys caught in the wild is believed to have been going on for years due to the colossal demand for laboratory monkeys in the U.S.

A former Native American boarding school reckons with its dark past

A CIA veteran who survived a hand-to-hand battle with Al Qaeda in Afghanistan is coming to the aid of his former Afghan comrades.

Illegal gold mining in southeastern Peru has fueled the destruction of a massive swath of rainforest and the killing of dozens of environmental activists.

Illegal gold mining in southeastern Peru has fueled the destruction of a massive swath of rainforest and the killing of dozens of environmental activists.

Mahsa Amini’s death has ignited a wave of protests across Iran, exposing a raw anger among Iranian women about their treatment by the regime and an unprecedented willingness to defy the government.

Prince William, Prince Harry and their spouses reunited at Windsor Castle on Saturday afternoon, appearing to put aside their rift to pay tribute to the Queen.

With the anniversary of 9/11 looming, so is something else — a need for money for survivors of the attack on New York's World Trade Center.

Boxes of paper records fill nearly every corridor of the ATF’s National Tracing Center, where agents are struggling to keep up with surging requests from local police.