Some question the need for a costly pill that's basically made of peanut flour. But with standardized capsules, more peanut allergy sufferers could gain access to a treatment now available to few.

Never mind a runner's high — the buzz some people say they get after a run. Neuroscientist Benedict Kolber was more interested in how to generate pain relief via a brisk walk. It can really work.

A year ago, President Trump was laughed at during his address to the U.N. General Assembly. This year, he'll face an audience of world leaders increasingly unclear about America's role in the world.