The first 500 people to use this link will get 2 free months of Skillshare Premium Membership: https://skl.sh/stevemould10 Molecules of biological origin always have a fixed handedness or chirality. For example you only ever see right handed sugars and left handed amino acids in nature. But why? Credits: Meteorite image - Art Bromage - https://commons.wikimedia.org/wiki/File:Murchison_meteorite.jpg RNA and DNA images - Sponk - https://commons.wikimedia.org/wiki/File:Difference_DNA_RNA-EN.svg Viking lander video - MASA You can buy my books here: https://stevemould.com/books You can support me on Patreon here: https://www.patreon.com/stevemould just like these amazing people: Joseph Galliera Nathan Williams Matthew Cocke Glenn Watson Mark Brouwer Joseph Rocca Joël van der Loo Doug Peterson Yuh Saito Rashid Al M Andrew Reeder Twitter: http://twitter.com/moulds Instagram: https://www.instagram.com/stevemouldscience/ Facebook: https://www.facebook.com/stevemouldscience/ Buy nerdy maths things: http://mathsgear.co.uk/