up-arrow notation

Numberphile talks with mathematician Ron Graham about the magnitude of Graham's number, building up from arrow notation to show how impossibly large it is. It is part of a series of videos on this number.

A George Carlin stand-up bit on euphemisms, tracing how language gets softened, such as shell shock becoming PTSD, until it loses its emotional force.

A short RepresentUs explainer on how money corrupts American politics and what an anti-corruption act could do about it. It covers lobbying, super PACs and campaign finance, and pitches the group's proposed reforms. The video was later superseded by an updated version.

A 16-minute Y Combinator Startup School talk in which Sam Altman lays out what makes a startup succeed. It covers building a product people tell friends about, exponential markets, real versus fake trends, and having an ambitious vision.

Clayton Christensen explains disruptive innovation using the steel industry, showing how mini-mills beat incumbents from the low end. He argues disruption is not about stupid or bad management.

A George Carlin routine on euphemisms and political correctness, tracing how shell shock became PTSD. The uploader adds context about euphemism in political language.

John Oliver's Last Week Tonight segment takes on Dr. Oz and the dietary supplement industry. It explains what is problematic about both, with a comedic wrap-up.

Ben Krasnow of Applied Science shows how to make and test YBCO high-temperature superconductor with a kiln and eBay chemicals. He demonstrates flux pinning and shows a close-up of the crystal structure.

An animated Sprouts video presenting Dietrich Bonhoeffer's argument that stupidity is more dangerous than evil, because reason cannot reach stupid people. It frames stupidity as a social and moral phenomenon.

A CollegeHumor sketch from the Hardly Working series in which a pair of startup founders pitch a website using incomprehensible buzzwords and branding nonsense. It parodies Silicon Valley startup culture.

LGR reviews the Danmere Backer16, a 1996 backup system that stored a PC's data on ordinary VHS tapes through a VCR. He shows the hardware and software on Windows 3.1 and 95.

Bill Gross, who has founded and incubated many start-ups, ranked hundreds of companies on five factors. He presents the one factor that stood out as the biggest predictor of success.

A live, overdub-free performance of 'Lingus' by Snarky Puppy, from the 'We Like It Here' DVD recorded in Utrecht. It features a Cory Henry keyboard solo.

Modern Vintage Gamer examines the claim from the Super Mario 64 decompilation project that the game shipped unoptimized, and puts it in the context of 1996 N64 development.

Pianist Tom Brier sight-reads a piano arrangement of the Super Mario World ending theme, working from a first-draft score by Keeper1st. He takes some liberties with the score as he plays.

Robert Scoble interviews Paul Graham at Y Combinator's Mountain View headquarters as 36 new startups debut. They discuss what YC is, and Graham's no-assholes rule.

A short Nature video on the discovery that our home supercluster is Laniakea, redefined by mapping the flow of galaxies rather than their density. It names the structure with a Hawaiian word meaning 'immeasurable heaven'.

California 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.

Matt Parker's stand-up routine about spreadsheets, taken from the Festival of the Spoken Nerd DVD Full Frontal Nerdity. It features Excel used in unexpected ways, including turning an image into a spreadsheet.

A five-minute SuperMemo demo of incremental reading: importing a Wikipedia article on nutrition, extracting passages, making cloze deletions and finishing the item. It lists the keyboard shortcuts used.

Smarter Every Day films Prince Rupert's drops, tempered glass drops, in high-speed slow motion at 130,000 fps. It shows how the drop's heavy internal stress lets the head survive hits while the tail shatters the whole thing.

Technology Connections explains why the superheterodyne radio has its name and how mixing frequencies lets it tune stations well. It walks through the underlying wave phenomena and algebra and why the design solved a hard tuning problem.

The Townsends channel shows how to make mushroom ketchup, a popular 18th-century sauce, in period style. It includes the history and a recipe and links to a blog post on whether George Washington used ketchup.

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.

Destin Sandlin of Smarter Every Day fires .22 Magnum and .38 Special bullets at Prince Rupert's drops, filmed at 170,000 frames per second. The slow-motion footage shows the bullet shattering against the glass tadpole while the drop initially survives.

A short clip of the Super Mario Bros 3 proof-of-concept PC port built by id Software's founders to pitch Nintendo on a PC version. Nintendo passed, and the same technology led to Commander Keen.

Smarter Every Day films a bullet hitting a Prince Rupert's drop with a high-speed camera at 150,000 fps. It shows how the glass drop's tough head and fragile tail behave on impact.

A campaign-produced compilation of clips of Donald Trump condemning racism and white supremacy on 38 occasions, published in 2020.

A Fully Charged episode where Robert Llewellyn visits an Oxford street trialling Urban Electric's pop-up chargers. These are retractable 7kW charging points built into street furniture for homes without off-street parking.

3Blue1Brown presents the Triangle of Power, an alternate notation that unifies powers, logarithms and roots in a single triangular symbol. The video shows how the inverse operations relate and how the notation could help.

Numberphile's Tony Padilla and Matt Parker discuss Graham's number, once the largest number used in a mathematical proof, and how enormous it is.

Tom Murphy's satirical SIGBOVIK 2007 presentation, delivered under a pseudonym, proving that generalized Super Mario Bros. is NP-complete. It is a short, deadpan take on a complexity theory result.

Stevie Wonder performs 'Superstition' on Sesame Street in 1973, with kids dancing along. It is a feel-good live music performance.

A nine-minute Stewart Lee stand-up routine about political correctness and the claim that it has gone mad. It is dry, layered British comedy that takes the complaint apart.

SethBling performs the first credits warp in Super Mario World on a real SNES console, a glitch that plays the ending without beating Bowser. The run relies on pixel-perfect positioning and tools such as a helper ROM hack.

The first episode of Mike Zamansky's Using Emacs series, covering setting up the package manager for new Emacs users as a start toward customization and efficient editing.

KRAZAM parody sketch in which an Excel streamer, Makro, treats the XLOOKUP function as a game-breaking meta change, spoofing e-sports commentary.

A re-upload of Rupert Sheldrake's TEDx talk The Science Delusion, which TED removed from its channel. He challenges what he calls the dogmas of modern science, including whether fundamental constants are constant.

A George Carlin stand-up bit from Doin' It Again about soft language and euphemism, showing how softened words hide uncomfortable facts. It touches on topics like shell shock and aging.

A clip from George Carlin's 1990 special 'Doin' It Again' in which he describes how American English has been sterilized with euphemisms, using examples such as shell shock becoming PTSD.