Is anything at the end of the rainbow? On this episode, Neil deGrasse Tyson and comic co-host Chuck Nice break down how rainbows work, the history behind zero, and what Zoom calls and Einstein’s Theory of Relativity have in common. First, we dive into what makes a rainbow. Discover what Isaac Newton wrote about in his book of “Opticks”. How did people used to think vision worked? We discuss a simple experiment you can do with the visual light spectrum at home. How does sunlight interacting with raindrops create a rainbow? Is there a pot of gold at the end of the rainbow? What is the end of the rainbow? Neil breaks down how every rainbow is your own personal rainbow. When did we invent zero, glitch, nil, nada? We explore ancient society, the conception of zero, and what other aspects of math we carry with us from that time. Did ancient Egypt or the Maya have zero? When did negative numbers start? Why did it take people so long to come up with nothing? What do Zoom calls and Einstein’s Theory of Relativity have in common? Learn about the connection between space and time. How do you prevent an asteroid from hitting Earth? You’ll also learn about worldlines and how a time machine would work. How does Zoom break down the space time? Find out on another Things You Thought You Knew Episode of StarTalk! Thanks to our Patrons Vincent Marsland, Brittany Welborn, L. Ali Campbell, David Kern, amjad, Steven Michaelis, Lady Anne ^^ö^^(Jessica M. Kandal, PhD), Christian Anderson, Nathan Hogue, and Marc Libman for supporting us this week. NOTE: StarTalk+ Patrons can watch or listen to this entire episode commercial-free. Get the NEW Cosmic Queries book (5/5 ⭐s on Amazon!): https://amzn.to/3dYIEQF Support us on Patreon: https://www.patreon.com/startalkradio FOLLOW or SUBSCRIBE to StarTalk: Twitter: http://twitter.com/startalkradio Facebook: https://www.facebook.com/StarTalk Instagram: https://www.instagram.com/startalk About StarTalk: Science meets pop culture on StarTalk! Astrophysicist & Hayden Planetarium director Neil deGrasse Tyson, his comic co-hosts, guest celebrities & scientists discuss astronomy, physics, and everything else about life in the universe. Keep Looking Up! #StarTalk #neildegrassetyson 00:00 - Intro: Things You Thought You Knew 2:45 - Isaac Newton & White Light 6:25 - What is a Rainbow? 11:34 - Double Rainbows 14:47 - When Zero Didn’t Exist 19:42 - Inventing Zero 23:30 - The Concept of Negative Numbers 26:44 - Zoom Calls & Einstein’s Relativity 28:22 - Space & Time Coordinates 30:37 - Deflecting an Asteroid 32:50 - Worldlines & Time Machines 34:31 - Breaking the Space Time Alliance 40:00 - Changing Velocity Vectors