Where Does the Electricity in Your Brain Come From? | Sleep on Physics

Inside your own head a current in a wire, a spark you were born with, a brain that burns more fuel when you think hard. It looked elegant on the surface. The reality would surprise most people — a twenty-watt saltwater battery, recharged ion by ion, with no reserve tank at all. From the brain's energy bill and a membrane five nanometres thick to frog legs kicking on an iron railing in Bologna. In this documentary, we explore the brain's energy budget, cerebral blood flow, the sodium-potassium pump, resting membrane potential, the squid giant axon at Plymouth in 1939, Hodgkin and Huxley's overshoot, Luigi Galvani's prepared frog, Volta's voltaic pile, the electric eel's electrocytes, ATP synthase as a rotary motor, mitochondria and the proton gradient, ketone bodies and the blood-brain barrier, myelin and saltatory conduction, and the sodium channel's selectivity filter. We also explore Otto Loewi's dream experiment, the patch clamp, brain soup and the 86 billion neuron count, and Hans Berger's first EEG in Jena. Along the way, we untangle the myths from the documented record, using primary sources and modern scholarship. New here? Snoozable Wonders is long-form science history for sleep — if tonight's episode helps you drift off, a like or a subscribe genuinely helps a small channel get found. Thank you so much for your support! ❤️ It truly means the world to me! Resources: Regulation of Cerebral Metabolic Rate – Basic Neurochemistry, NCBI Bookshelf – https://www.ncbi.nlm.nih.gov/books/NB... The Ionic Basis of the Resting Membrane Potential – Purves, Neuroscience, NCBI Bookshelf – https://www.ncbi.nlm.nih.gov/books/NB... Jens C. Skou and the Sodium-Potassium Pump – The Nobel Prize in Chemistry 1997 – https://www.nobelprize.org/prizes/che... Frogs and Animal Electricity – Whipple Museum of the History of Science, University of Cambridge – https://www.whipplemuseum.cam.ac.uk/e... Hans Berger and the First Human Brain Recording – Advances in Physiology Education – https://journals.physiology.org/doi/f...