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A React Conf talk by Xuan Huang previewing React Forget, a compiler that automatically memoizes components. It argues for making memoization the default so developers need not write useMemo or useCallback by hand.

An episode of REACT in which children try to figure out 1970s-1980s computers, including an Apple II and floppy disks. It was made to promote the AMC show Halt and Catch Fire.

James Mickens of Harvard gives a funny lecture at HBS's Future Assembly arguing that blockchains are a very bad idea. He covers their trust, legal and practical shortcomings for real-world problems.

Anders Brownworth gives a basic visual introduction to blockchain using an interactive web demo, covering SHA256 hashes, blocks, chains, distribution, tokens and coinbase transactions.

A REACT episode where teenagers try Windows 95 for the first time and react to the retro interface and technology.

A five-minute lightning talk from React.js Conf 2016 by Elie Rotenberg on protecting the DOM from tampering. It shows how React tree obfuscation (react-armor) can shuffle class names, tags and tree structure to defeat CSS-selector-based ad blocking.

A short Harvard Online animated lesson on how the mitochondrial electron transport chain works. It shows proton pumping and the machinery that drives ATP synthesis.

Tom Occhino and Jordan Walke present how Facebook builds JavaScript apps, in the talk where React was first publicly announced at JSConf US 2013.

TheRasteri upgrades a single PC through every Windows version, from early releases through Windows 10, testing that old software keeps running. It is an updated version of the Chain of Fools experiment.

Asianometry explains that the worst of the 2021-22 chip shortage sits in trailing-edge semiconductors, not the leading-edge chips usually covered. It covers why those older-node fabs are so hard to expand and fix.

Wendover Productions explains the wave of supply shortages in 2021, arguing the causes go beyond COVID. It covers how just-in-time manufacturing was applied, container imbalances and the chip shortage.

Tom Scott explains why electronic voting is a bad idea. Elections must be trusted by everyone and attacks on software scale in ways attacks on paper do not, so open source or blockchain fixes do not solve it.

A SciShow episode in which Hank Green introduces five of the most dangerous chemicals, from lethal toxins to substances that explode on contact. It is an entertaining overview of extreme chemical hazards.

A former fusion scientist argues why fusion power by 2040 is unrealistic, covering the physics challenges, neutron issues and optimistic company claims, with a brief note of good news.

Designer Thomas Thwaites describes his attempt to build a toaster from scratch, from mining ore and deriving plastic from oil. It is a short TED talk on how much civilization a simple object depends on.

TheRasteri installs MS-DOS and Windows 1.0, then upgrades in place through nearly every Windows version up to Windows 7, checking which programs survive. Even Doom from 1993 still runs at the end.

A commentary video by YouTuber PaymoneyWubby reacting to children's content on the Musical.ly app, which became TikTok. It highlights the child-safety concerns of young kids dancing on a public social platform.

A Downfall-style parody in which Hitler rages about functional programming concepts such as monads and Haskell. It runs about four minutes.

A short Tim and Eric Awesome Show sketch, The Universe I, II & III, in which the cosmos is shown in a deliberately absurd way. It is an Adult Swim surreal comedy bit.

ACS Reactions investigates why Mexican Coke, supposedly cane sugar sweetened, tested as having glucose and fructose, explaining that sucrose breaks down in acidic soda.

A Gamereactor interview at E3 2012 with John Carmack, who shows his lag-free head-mounted display running DOOM 3 BFG Edition. He discusses what the headset could mean for the games industry.

A CAD-based animation from the Max Planck Institute for Plasma Physics showing how the Wendelstein 7-X stellarator is configured and what its fusion research aims to achieve. It runs about 11 minutes.

Wendover Productions explains how overnight shipping works, covering the hub-and-spoke logistics of companies like FedEx and UPS and the use of cargo aircraft. It touches on the economics that make next-day delivery possible.

FortNine explains the economics of the dealership model, arguing that dealers absorb inventory risk and help manufacturers' finances. It looks at whether cars and motorcycles could be sold more cheaply without them.

Mark Rober builds a glitter-bomb booby-trapped package to take revenge on porch pirates, filming the thieves' reactions. Some reactions were later acknowledged as partially staged.

A short film from the Competitive Enterprise Institute adapting Leonard Read's 1958 essay I, Pencil, showing how no one person knows how to make a pencil and how many people cooperate without central planning.

Wendover Productions explains how the US military moves people and materiel worldwide, including prepositioned equipment, sealift and airlift. It shows the scale of the logistics system behind US force projection.

Real Engineering looks at why nuclear power plants are expensive and how their economics compare with fossil and renewable alternatives. It is based on a video from the Illinois Energy Professors.

Linus Tech Tips warns against cheap Android TV boxes, many of which ship with preinstalled malware. It looks at several boxes and suggests safer alternatives such as Chromecast and Nvidia Shield.

Linus Tech Tips tests whether chaining many PCIe riser extensions causes loss of GPU performance. They keep adding extensions to see how far the signal will go.

A short clip from the film Spies Like Us in which unprepared characters take a CIA agent test and Chevy Chase cheats his way through it.

Every Frame a Painting analyzes how Jackie Chan stages action comedy, with nine principles such as starting from a disadvantage, using the environment, clear shots, and keeping action and reaction in the same frame.

Psychologist Melanie Joy's TEDxMunchen talk introduces carnism, the invisible belief system that conditions people to eat some animals but not others, and how it shapes reactions to food choices.

A clip from Attenborough's Life of Mammals following a San tribesman in the Kalahari on an eight-hour persistence hunt, running down a kudu through harsh heat. It shows tracking, endurance running and the hunter's reaction after the kill.

CGP Grey explains how traffic jams come from human driving behavior such as tailgating and reaction delays, and how leaving gaps and smoothing speed would reduce congestion. It also touches on self-driving cars.

Louis C.K. on Conan explains why he won't give his kids cell phones. He argues that phones keep people from sitting with sadness and being alone with their thoughts, and that kids lose empathy when they cannot see another person's reaction.

Footage from the Macworld Boston 1997 keynote where Steve Jobs announces Apple's deal with Microsoft, with Bill Gates appearing on the big screen. The almost bankrupt Apple took Microsoft's investment, and the crowd reacted badly, including booing over Internet Explorer as the default browser.

A 20-minute S3 episode touring Terraform Industries, a startup making synthetic natural gas from air and solar power. It walks through the reactor, injection system, direct air capture and electrolyzer, plus the company's cost goals and next milestone.

Periodic Videos visits a fluorine expert to show how reactive the element is in action. It also includes a discussion of fluoride and tooth enamel.

A hidden-camera social experiment in a park where three people try to steal a bike in the open: a white teenager, a black teenager and a young woman. It records how bystanders react to each.