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We know that some knots hold better than others, but the why of it hasn't been so clear. Special fibers that change color under strain are providing some answers.

People with sickle cell disease aren't fueling the opioid crisis, research shows. Yet some ER doctors still treat patients seeking relief for agonizing sickle cell crises as potential addicts.

More and more incarcerated students are getting access to educational technology. These technologies offer access where education is limited, but not much is known about the quality of the programs.

The rail strikes in France protesting planned changes to the national retirement system are now the longest in recent memory — and unions are calling for wider disruption.

President Trump continues to attack Democrats for homeless population growth in places like California and New York, but his administration has yet to decide on a plan.

The movie is shooting "right now," Marvel Studios president Kevin Feige said at the New York Film Academy. Marvel's goal, Feige says, is to "represent the world."

President Trump's impeachment trial will test Collins' reputation for centrism and independence. She is a potential swing vote and is facing a difficult reelection.

Illinois is the 11th state to legalize recreational marijuana. Democratic Governor J.B. Pritzker says it's not to make cannabis widely available, but to "maximize equity" — including 11,000 pardons.

The U.S. killed Iran's top general in a strike at Baghdad airport. NPR's Noel King talks to Robin Wright, contributing writer to The New Yorker, about rising diplomatic tensions in the region.

The commander of Iran's Quds Force was largely responsible for the expansion of Shiite power and influence in Iraq, Syria, Lebanon and Gaza.