Special guest Hank Green takes a random dip into the card catalogue at The Royal Society... What will he find?! More links below ↓↓↓ Featuring YouTuber, author and podcaster Hank Green speaking with Brady. Check out Hank's Channels: Crash Course: null SciShow: null Vlog Brothers: null Hank's website: https://www.hankgreen.com/ And book: https://amzn.to/2HbSLT5 Objectivity on Patreon: https://www.patreon.com/objectivity Subscribe to Objectivity: http://bit.ly/Objectivity_Sub Films by James Hennessy and Brady Haran Royal Society website: http://bit.ly/Royal_Society The Royal Society's own YouTube channel: null Barnacle photo credit - MichaelMaggs / Wikipedia Commons Facebook: https://www.facebook.com/ObjectivityVideos Twitter: https://twitter.com/objectivity_vid Patron thank you page: http://www.bradyharanblog.com/objectivity-patrons Objectivity T-Shirts: null