A subset of AI called reinforcement learning is helping scientists improve nuclear fuel technology, which they could use to power spacecraft and rockets.

More than 8 million people turned out at over 3,300 No Kings protests across all 50 states on Saturday, organizers said, calling it the largest single-day demonstration in U.S. history. Bruce Springsteen performed at the flagship Minneapolis rally.

A Texas boy’s second dose of the MMRV vaccine cost over $1,400. A Pennsylvania woman’s long-acting birth control cost more than $14,000. Treatment for a Florida Medicaid enrollee’s heart attack cost nearly $78,000 - about as much as surgery for an uninsured Montana woman’s broken arm.Subscribe to The Post Most newsletter for the most important and interesting stories from The Washington Post. In 2025, these patients were among the hundreds who asked Bill of the Month to investigate their medical