Jon Hamilton

Friday marked the busiest day for the nation's airports since COVID-19 put the brakes on air travel almost a year ago. But the number of travelers remains far below 2019 levels.

Researchers launched a major study of an experimental Alzheimer's drug this summer. They also learned a lot about how to protect participants who must make frequent visits to a medical center.

With less structure and supervision than is typically provided inside a classroom, remote classes lean hard on already stressed parents to help students with ADHD stay focused and engaged.

A coronavirus vaccine could become ineffective if the virus were to undergo certain genetic changes. But so far, so good: Scientists see no evidence that's happening.

After a decade of failure in treating Alzheimer's with drugs, the National Institutes of Health is funding a five-year effort in Seattle to learn more about how the disease starts in the brain.

One medical student was addicted to opioids. Another relied on them to control disabling pain. Both think their experiences will help them be better doctors when it comes to prescribing opioids.

Research on young mice and rats shows how nicotine hijacks brain systems involved in learning, memory, impulse control and addiction.

Scientists seem to have answered a fundamental question about the nature of memory. They have found compelling evidence that memories are made by strengthening connections between certain brain cells.

Women with multiple sclerosis often find that they have fewer problems when they are expecting. That led researchers to develop an experimental drug based on a hormone associated with pregnancy.

The research project would place electronic devices in the brain in an attempt to combat post-traumatic stress, depression and other problems that have plagued many veterans of Iraq and Afghanistan.