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Blue light on, and a mouse starts walking in circles. Light off, and it stops. The switch inside its brain came from green scum on a pond. | WhyFi Nobel Special In a lab at Stanford, a mouse with a thin fibre on its head starts turning in circles the moment a blue light comes on. Light off, and it stops, cleans its whiskers and goes back to sniffing. The 2026 Nobel Prize in Physiology or Medicine has gone to the three scientists behind that switch: Karl Deisseroth, Peter Hegemann and Georg Nagel, "for their discoveries concerning light-gated ion channels and optogenetics". THIS EPISODE'S QUESTIONS: What did scientists find inside a one-celled alga that can switch on a brain cell? How does optogenetics work? And can light really control a human brain? THE PROBLEM. Scientists knew which parts of the brain handle which jobs, but could not prove that one type of nerve cell caused one feeling or behaviour. Francis Crick imagined switching single nerve cells with light, and admitted it sounded far-fetched. THE ALGA'S EYE. In the early 1990s, in Germany, Peter Hegemann asked how Chlamydomonas, a green alga made of one cell, reacts to light within half a millisecond. Our eyes need at least 10. His guess: one protein catches the light and is also the gate. Few believed him. THE INDIAN NAME. Hegemann's group found two genes for the protein. Open the two discovery papers, Science 2002 and PNAS 2003, and one author is Suneel Kateriya. Both are on the Nobel committee's own list of key publications. Today he is a professor at JNU, Delhi. THE FROG'S EGG. Georg Nagel put the genes into frog eggs. Under light, a channel opened within 0.2 milliseconds. Hegemann was right. The protein was named channelrhodopsin. ONE IN THE MORNING. Karl Deisseroth, shaken by what he saw in a psychiatric clinic, put Nagel's gene into rat nerve cells at Stanford. Around 1 am on 4 August 2004, blue light made one fire. In 2006 the method got its name: optogenetics. INSIDE A LIVING BRAIN. In 2007 a thin optical fibre moved a mouse's whiskers with light. In 2012, with Susumu Tonegawa, they switched on a frightening memory, and a mouse in no danger showed fear. IS THIS MIND CONTROL? No. Your nerve cells don't carry an alga's protein. It needs a gene in the brain and a fibre for the light. It doesn't read thoughts and isn't a brain chip. Its first steps as a treatment are in the eye: in trials for retinitis pigmentosa, a blind person with special glasses could find and pick up objects on a table. Next time you see green scum on still water, stop and look for a second. The brain's switch came from there. Watch it, sit with it, and leave your own "why" in the comments. The next episode could be your question. CHAPTERS 00:00 A Mouse, A Blue Light, A Switch 03:22 The Machine Inside Your Skull 06:34 How A Neuron Switches On 07:58 An Eye Inside A Single Cell 10:14 The Indian Name On Both Papers 11:22 Light On A Frog's Egg 13:35 One O'Clock In The Morning 15:46 Gene, Virus, Light 19:13 Switching On A Memory 19:51 Can Light Control Your Brain? 21:43 Sight For Eyes That Stopped Seeing 22:53 The Needle And The Sword Nobel Prize Illustrations: © The Nobel Committee for Physiology or Medicine. Ill. Mattias Karlén Laureate portraits: © Nobel Prize Outreach. Ill. Niklas Elmehed Announcement livestream (5 Oct 2026) and Karl Deisseroth's interview call: Nobel Prize Outreach Popular information page: nobelprize.org Some illustrations in this video were generated with AI. CREDITS Host - Ayush Yadav (@Ayushkaari) Researcher - Ayush Kumar(Neutrino) Production Design - Srishti, Prabhat Edited by Shivangi Sharma & Varun Rastogi DOP - Amir & Anand Creatives by Ratnesh Chaudhary. Thumbnail - Vikas A KhabarGaon production. #WhyFi #NobelPrize2026 #Optogenetics #Neuroscience #ScienceInHindi #KhabarGaon Khabargaon is a modern-day digital platform that helps you travel through current affairs, explainers, ground reports, interviews and unique video shows. Stay tuned for more and more! Khabargaon holds the copyright to this video. Use by others is not allowed without written consent. For permission, email [email protected] Website: https://khabargaon.com/ Subscribe to our channel and turn on notifications to get the latest: https://www.youtube.com/@Khabargaon Connect us on Facebook: https://www.facebook.com/khabargaon Instagram: https://www.instagram.com/khabargaon Twitter: https://x.com/khabar_gaon WhatsApp: https://whatsapp.com/channel/0029Vatc88NLSmbj4E6Rmi3C

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