Sight: The Greatest Miracle in the History of Life

Hey guys! We’re now live on Spotify🎧 Listen here: https://open.spotify.com/show/5rqQFYd... For three billion years, the Sun rose over a living planet and nothing on it had ever seen anything. Then eyes appeared, and kept appearing, in jellyfish with no brains, in scallops with mirrors, in animals that grew lenses of stone. Tonight a single particle of light can reach your awareness. So how did life learn to see? A slow walk from rays imagined pouring out of the eye to a molecule older than any eye. Get cozy and let this long walk through the story of sight keep you company tonight. Subscribe to Sundown Science if you enjoy the long way around the universe. CHAPTERS 0:00 Introduction 1:26 A Window in Your Head 11:19 The Organ That Frightened Darwin 21:44 Inside the Camera 32:08 Visual Purple 42:36 One Photon 53:31 Why This Light? 1:03:33 Eyes Before Eyes 1:14:29 The Gene That Builds Eyes 1:24:54 Forty Separate Beginnings 1:35:20 The First Eyes in the Rock 1:46:04 The Price of Seeing 1:57:02 The Greatest Miracle in the History of Life SOURCES Evolution of the eye (Wikipedia) — https://en.wikipedia.org/wiki/Evoluti... Ibn al-Haytham and the Book of Optics (Wikipedia) — https://en.wikipedia.org/wiki/Ibn_al-... Important dates in vision science (UC Irvine) — https://sites.socsci.uci.edu/~jyellot... Darwin to Asa Gray, 3 April 1860 (Darwin Correspondence Project) — https://www.darwinproject.ac.uk/entry... Optography and Wilhelm Kühne (Wikipedia) — https://en.wikipedia.org/wiki/Optography George Wald (Wikipedia) — https://en.wikipedia.org/wiki/George_... Conical intersection in retinal isomerization (Nature Chemistry) — https://www.nature.com/articles/nchem... Study suggests humans can detect single photons (Rockefeller University, 2016) — https://www.rockefeller.edu/news/1180... The mantis shrimp sees like a satellite (National Geographic) — https://www.nationalgeographic.com/sc... Single-celled creature has eye made of domesticated microbes (National Geographic, 2015) — https://www.nationalgeographic.com/sc... Induction of ectopic eyes by targeted expression of eyeless (Science, 1995) — https://bio.davidson.edu/Molecular/re... Inside the eye: nature's most exquisite creation (National Geographic) — https://www.nationalgeographic.com/ma... World's oldest eye found in an Estonian fossil (Estonian World, 2017) — https://estonianworld.com/knowledge/s... Large eyes come at a high cost (Lund University, 2015) — https://www.lunduniversity.lu.se/arti... The retina (Neuroscience for Kids, University of Washington) — https://staff.washington.edu/chudler/... — Disclaimer: All videos are produced for entertainment and education. Factual claims are sourced from peer-reviewed research and official scientific institutions. Where a video explores speculation, fringe theories, or the creator's own analysis, it is clearly labeled as such. Sundown Science is not a news outlet. Watch at your own discretion. IMAGE SOURCES Wikimedia Commons: https://commons.wikimedia.org #EvolutionOfTheEye #HumanVision