Radiolab is one of the most popular and longest-running shows on NPR, with 1.8 million listeners per week and over 500,000 podcast subscribers.

Radiolab is on a curiosity bender. We ask deep questions and use investigative journalism to get the answers. A given episode might whirl you through science, legal history, and into the home of someone halfway across the world. The show is known for innovative sound design, smashing information into music. It is hosted by Lulu Miller and Latif Nasser.

VOLUME 2: TIME

“The Secret to a Long Life”—Producer Sindhu Gnanasambandan wants to know how she can live the longest feeling life possible. The answer leads her on a journey to make one week feel like two. And the journey leads her to a whole new answer.

“Octomom”—In 2007, Bruce Robison’s robot submarine stumbled across an octopus settling in to brood her eggs. What began as a simple act of motherhood became a heroic feat that has never been equaled by any known species on Earth.

“Human vs. Horse” (Radiolab for Kids)—In one of our favorite Radiolab animal episodes of all time, we head to a human vs. horse race in the desert of Arizona. Turns out it has everything to do with what gives us humans … our humanity. Also our butts.

“Loops”—Our lives are filled with loops that hurt us, heal us, make us laugh, and, sometimes, leave us wanting more. This hour, Radiolab revisits the strange things that emerge when something happens, then happens again, and again, and again …

“The Times They Are a-Changin’”—At the start of a new year we crack open some fossils, peer back into ancient seas, and look up at lunar skies to find that a year is not quite as fixed as we thought it was.