NPR's A Martinez speaks with tech entrepreneur Bryan Johnson about the Netflix documentary "Don't Die: The Man That Wants To Live Forever," which portrays his quest to slow aging.

A team of scientists has shown it's possible to reduce inflammation in rheumatoid arthritis by stimulating the vagus nerve.

NPR's Ayesha Rascoe plays the puzzle with Weekend Edition Puzzlemaster Will Shortz and Lauren Cusitello of San Diego, Cali.