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Cosmo Explains

Long, calm, deeply researched physics and science explainers narrated for sleep and focus.

3videos

Every Confusing Thing About How Antennas Work Explained Slowly (For Sleep)

A slow, complete history of the antenna, from James Clerk Maxwell's four equations in 1865 through Heinrich Hertz's first deliberate transmitter and Guglielmo Marconi's transatlantic gamble, to Karl Jansky and Grote Reber's accidental birth of radio astronomy, the wartime MIT Rad Lab, and the phased arrays and MIMO systems inside a modern 5G phone. Cosmo Explains walks both the people and the physics: why a dipole radiates but a power cord doesn't, why antenna length tracks wavelength, how gain trades against beamwidth, and why reciprocity means every antenna transmits and receives with the identical pattern. It closes on the Deep Space Network hearing Voyager 1 at 10 to the minus 25 watts, GPS beam shaping, and the six-plus antennas packed into a smartphone, landing on four ideas, resonance, superposition, phase, and aperture, that explain everything from a Yagi rooftop antenna to a reconfigurable intelligent surface.

PhysicsScienceNetworkingSep 27, 2026

2:07:14

Cosmo Explains

Everything About Machine Learning Explained Slowly (For Sleep)

The entire history of machine learning told slowly and in order, from Ramon Llull's rotating discs and Ada Lovelace's objection to the multimodal systems hundreds of millions of people use today. Cosmo Explains walks the mechanisms as well as the people: how a McCulloch Pitts neuron computes, how Rosenblatt made one learn, why XOR broke the perceptron and froze the field, how backpropagation uses the chain rule to assign blame three layers deep, why overfitting made SVMs and maximum margins the respectable choice for two decades, and how data, GPUs and a few simple architectural tricks converged on AlexNet in 2012. From there it is ResNet's skip connection, the transformer throwing away recurrence, next word prediction buying grammar and reasoning for free, CLIP and diffusion, and finally Goodhart's law and the alignment problem. The register is built for sleep; the content is a full course.

AIDeep LearningScienceJul 25, 2026

2:08:33

Cosmo Explains

Every Confusing Thing About Thermodynamics Explained Slowly (For Sleep)

A slow, complete history of thermodynamics, from the steam engines that pumped water out of British coal mines to the heat death of the universe. It runs through caloric theory and Count Rumford's cannon boring, Carnot's unbreakable efficiency ceiling, Joule's paddle wheel, the first and second laws of Clausius and Kelvin, Boltzmann's S equals k log W and his tragedy, Nernst's third law at absolute zero, and the zeroth law. It then shows the same handful of laws running engine cycles, refrigerators, Maxwell's demon and the heat cost of erasing information, the Earth as a heat engine, and the greenhouse effect first measured by Eunice Foote in 1856. It closes on the arrow of time, the low entropy Big Bang, and life as a temporary pocket of order surfing on entropy increase.

PhysicsScienceJun 15, 2026