You can support us on Patreon: https://www.patreon.com/periodicvideos More links in description below ↓↓↓ Here's even more about heavy water, or deuterium oxide, including a discussion of its role in World War II and whether it is dangerous to humans? Our main water video is at https://www.youtube.com/watch?v=hUVzb0fzHsk Support Periodic Videos on Patreon: https://www.patreon.com/periodicvideos A video on every element: http://bit.ly/118elements More at http://www.periodicvideos.com/ Follow us on Facebook at http://www.facebook.com/periodicvideos And on Twitter at http://twitter.com/periodicvideos From the School of Chemistry at The University of Nottingham: http://bit.ly/NottChem Periodic Videos films are by video journalist Brady Haran: http://www.bradyharanblog.com/ Join Brady's mailing list for updates and extra stuff --- http://eepurl.com/YdjL9