YouTube video by Journey to the Microcosmos

Introducing the very first Crash Course Podcast! Over the next 11 episodes, John Green and Katie Mack will walk through the entire history of the universe… even the parts that aren’t written yet. Episode 1 premieres April 24th and can be streamed here on the Crash Course channel and wherever else you get your podcasts. Subscribe at https://complexly.io/theuniverse Thank you to the Perimeter institute for letting us use some of their footage here. You can find those videos featured here: Introducing: Quantum 101 with Katie Mack https://youtu.be/Xt1hO7YvNx0?si=PPxFf0sfndSRynkt Katie Mack is coming to Perimeter Institute https://youtu.be/fa4cLiAwgVA?si=3dzM_79AU42wUy1L Additional footage provided by NASA. *** Crash Course is on Patreon! You can support us directly by signing up at http://www.patreon.com/crashcourse Thanks to the following patrons for their generous monthly contributions that help keep Crash Course free for everyone forever: Leah H., David Fanska, Andrew Woods, DL Singfield, Ken Davidian, Stephen Akuffo, Toni Miles, Steve Segreto, Kyle & Katherine Callahan, Laurel Stevens, Burt Humburg, Perry Joyce, Scott Harrison, Mark & Susan Billian, Alan Bridgeman, Breanna Bosso, Matt Curls, Jennifer Killen, Jon Allen, Sarah & Nathan Catchings, team dorsey, Bernardo Garza, Trevin Beattie, Eric Koslow, Indija-ka Siriwardena, Jason Rostoker, Siobhán, Ken Penttinen, Nathan Taylor, Barrett & Laura Nuzum, Les Aker, William McGraw, Vaso, ClareG, Rizwan Kassim, Constance Urist, Alex Hackman, Pineapples of Solidarity, Katie Dean, Stephen McCandless, Wai Jack Sin, Ian Dundore, Caleb Weeks __ Want to find Crash Course elsewhere on the internet? Instagram - https://www.instagram.com/thecrashcourse/ Facebook - http://www.facebook.com/YouTubeCrashCourse Twitter - http://www.twitter.com/TheCrashCourse CC Kids: http://www.youtube.com/crashcoursekids

Of all the animals that we’ve examined in the microcosmos, leeches are probably one of the few that can be used as a verb, to leech off someone—to take and t...