Get 70% off NordVPN for the first 3 years and an additional 30 days free: https://nordvpn.com/steve and use the promo code steve How does vision work on the molecular level? It all starts with a molecule in your rod and cone cells called retinal that flips from one conformation to another when visible light photons hit it. What follows is fascinating - the phototransduction cascade, that leads ultimately to neurons firing in your brain. I mention my last video in this one. Here it is: https://www.youtube.com/watch?v=HauiF_AQUIY 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: Matthew Cocke Nathan Williams Mark Brouwer Joseph Thomas Glenn Watson Joël van der Loo Deneb 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/