Dr. Katie Mack, a theoretical astrophysicist, walks #1 New York Times bestselling author John Green through the history of the entire universe – including the parts that haven’t been written yet. All episodes of this limited series Crash Course podcast are now available.

The Anthropocene is the current geological age, in which human activity has profoundly shaped the planet and its biodiversity. On The Anthropocene Reviewed, John Green (The Fault in Our Stars, Turtles All the Way Down, Everything is Tuberculosis) reviews different facets of the human-centered planet on a five-star scale.

Launched in January 2017, 100 Days follows John Green and Chris Waters on a quest to improve their fitness and health over a one hundred day period. Two averagely unfit guys in their (very) late 30s, they learn from experts how to make sustainable changes in their lives. Along the way, they attempt to turn a midlife crisis into something healthier, more thoughtful, and maybe even a little productive. Not currently in production.

Hosts John and Hank Green (authors and YouTubers) offer both humorous and heartfelt advice about life’s big and small questions. They bring their personal passions to each episode by sharing the week’s news from Mars (the planet) and AFC Wimbledon (the fourth-tier English football club).

At Crash Course, we believe that high quality educational videos should be available to everyone for free. The Crash Course team has produced more than 50 courses to date, and these videos accompany high school and college level classes ranging from the humanities to the sciences. Crash Course transforms the traditional textbook model by presenting information in a fast-paced format, enhancing the learning experience.