Brothers Ian, Sam, and Eli want to know, “How do vaccines keep our bodies healthy?” We meet two scientists, Omar Khan and Jasdave Chahal, who have teamed up to tackle the world’s most dangerous diseases with a new technique for developing vaccines. They tell the story of how they came together in a quest to battle biological “ninjas” that want to invade our bodies and make us sick. Are you a teacher or homeschooling parent? Tell us how you use Tumble! Email us at firstname.lastname@example.org. We love hearing from you! Want an ad-free version of Tumble? It’s only $1 each month. Pledge on Patreon to get access to this special podcast feed, including Marshall’s original music. Let us know how you use Tumble. Send us your questions and drawings! Don’t forget to subscribe and leave us a review on Apple Podcasts or Stitcher. Thanks for listening!