Dig into the science of how bone marrow transplants work and find out how you could become a donor by visiting bethematch.org -- Bones might seem rock-solid, but they’re actually quite porous inside. Most of the large bones of your skeleton have a hollow core filled with soft bone marrow. Marrow's most essential elements are blood stem cells and for patients with advanced blood cancers like leukemia and lymphoma, the best chance for a cure is often a bone marrow transplant. How does this procedure work? Melody Smith explains. Lesson by Melody Smith, directed by Artrake Studio. Animator's website: www.artrake.com Sign up for our newsletter: bit.ly/TEDEdNewsletter Support us on Patreon: bit.ly/TEDEdPatreon Follow us on Facebook: bit.ly/TEDEdFacebook Find us on Twitter: bit.ly/TEDEdTwitter Peep us on Instagram: bit.ly/TEDEdInstagram View full lesson: ed.ted.com/lessons/how-bones-make-blood-melody-smith Thank you so much to our patrons for your support! Without you this video would not be possible! JackKeyton, Matthew D. Vigil, Amin Shahril, Adriano Fontes, Xiao Yu, Fatima Kried, Aravind Battaje, Melissa Suarez, Jason Duncan, Brian A. Dunn, Francisco Amaya, Daisuke Goto, Matt Switzler, Chhunheng Veng, Leonardo Monrroy, Sumedh Ghaisas, Guhten, Amer Harb, Dowey Baothman, Norbert Orgován, Shafeeq Ansari, Gabriel Balsa, Maryam Sultan, Bethany Connor, Jeremy Shimanek, Adam Foreman, Sebastiaan Vleugels, Lâm Nguyễn, Mark Byers, Bradley Heinold, Monkeypatcher, Laurence McMillan, Connor Roberts, Dmitry Neverov, Tonya Ratliff-Garrison, Avinash Amarnath, Eric McDaniel, Cristian Cristian, France Lipužič, EdoKun, Rare Media, Rayo, Faizan, Elizabeth Gu, Nazmul Idris, Po Foon Kwong, Siobhan O'Connor Gwozdz, NinjaBoffin, Jesse Jurman and Josue Perez Miranda.