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In briefA behind-the-scenes tour of the ILFORD factory in Mobberley, England, showing how black and white film, paper and chemicals are made. It walks through emulsion making, coating, finishing, QC and distribution.
In briefMark Rober builds a hot tub filled with sand fluidized by air blown from below, so that the sand behaves like a liquid. He explains how fluidized beds work and shows people swimming in them.
In briefTechnology Connections explains the difference between power (watts) and energy (watt-hours) and why confusing them leads to errors. It runs about 52 minutes and uses everyday examples.
In briefFlanders and Swann perform 'First and Second Law', a comic song about the laws of thermodynamics, from their 1964 stage show At the Drop of Another Hat. It sets the first and second laws to a deadpan call-and-response routine.
In briefSpencer Lisenby explains dynamic soaring, a technique that lets unpowered radio-controlled gliders reach speeds above 835 kph. He covers the physics and the design, build and flying challenges.
In briefNightHawkInLight demonstrates how a Tesla valve works by sending a propane flame front through one, making the flow visible. It is a short, hands-on experiment video.
In briefA demonstration comparing what a month of vaping versus a month of smoking cigarettes does to the lungs, using a filter to show the residue. It is part of a series of similar experiments.
In briefCalifornia Superbike School demonstrates its 'No B.S.' bike, which has fixed handlebars so riders can only steer with body lean. It illustrates how little control that gives compared with countersteering.
In briefSabine Hossenfelder explains that waste heat from ever-growing energy use could eventually boil the oceans in a few centuries, whatever the energy source. She discusses proposed ways to cool the planet.
In briefDave Jones of EEVblog and Richard Stephenson tour the 70m DSS43 dish at the Canberra Deep Space Communication Complex and explain how NASA talks to Voyager 2. It covers the transmitters, receivers and tracking involved.
In briefBuilder Matt Risinger freezes water-filled copper and PEX piping capped with SharkBite fittings to see which survives. The video compares how each pipe type handles freezing.
In briefSixty Symbols interviews Nottingham cosmologist Tony Padilla, who says string theory deserves to be taken seriously. He explains how strings emerged from the equations rather than being invented.
In briefVeritasium visits the US Navy's Crane facility to test top night vision goggles. It explains how image intensifier tubes and thermal or digital systems work and compares the generations of the technology.
In briefA 1968 NASA film from the US National Archives explaining why the US needed a nuclear rocket and how the engine works. It also shows combined nuclear and chemical stages for a manned Mars mission.
In briefProfessor Jeff Dahn lectures on why lithium-ion batteries die and how chemistry changes could make them last decades.
In briefSpaceX's recap of the Falcon Heavy debut launch, with side booster landings and a Tesla Roadster with Starman sent into orbit.
In briefFull recording of Elon Musk's January 2015 presentation and Q&A at the SpaceX Seattle office announcement. He lays out plans for a satellite constellation to provide low-latency global internet, tied to funding Mars ambitions. Pauses between questions have been edited out.
In briefTechnology Connections explains in 33 minutes why thermoelectric (Peltier) cooling is far less efficient than compressor-based refrigeration.
In briefScott Manley explains the thermal balance of spacecraft and how a satellite could be configured to radiate away the heat from datacenter-scale computing in space. His rough numbers suggest it is feasible.
In briefScienceClic gives a 15-minute animated introduction to quantum field theory, covering fields, spin, conserved quantities, the standard model and interactions.
In briefACS Reactions investigates why Mexican Coke, supposedly cane sugar sweetened, tested as having glucose and fructose, explaining that sucrose breaks down in acidic soda.
In briefA Channel 4 Equinox documentary on the NK-33 engines built for the Soviet N1 moon rocket and how they ended up in the USA. It includes rare footage and interviews with veterans of the early Soviet space program.
In briefVeritasium visits Chernobyl, Fukushima and other places to find who on Earth is exposed to the most ionizing radiation. The answer turns out to be surprising and puts radiation risk in context.
In briefVeritasium's Derek Muller spends an hour in a silent, dark anechoic chamber at BYU to test the claim that 45 minutes is the most anyone can bear. He reports on his experience and other people's reactions.
