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The first lecture of Gilbert Strang's MIT 18.06 Linear Algebra course, covering the geometry of linear equations. It opens a full 35-lecture university course.

David Heinemeier Hansson's talk at Startup School 2008 on building a profitable startup. He argues for bootstrapping and small, well-run companies instead of chasing investment and exits.

A short clip from Carl Sagan's Cosmos in which he explains how Eratosthenes measured the circumference of the Earth using shadows in two Egyptian cities. It is a clear, visual account of an ancient scientific feat.

Paul Graham speaks at Startup School 2008 about how to create a successful startup. His talk emphasizes being good, not just avoiding being evil, as a strategic advantage.

Nardwuar interviews Pharrell and Shay of N.E.R.D. in Vancouver, using his trademark deep research and gifts. The extended version runs about ten minutes.

Paul Buchheit, creator of Gmail and founder of FriendFeed, speaks at Startup School 08 about listening to users. He covers feedback, features, aiming for 100 happy users, and treating "that's impossible" as a statement of limited experience.

Mike Arrington of TechCrunch speaks at Startup School 2008 about how to get press coverage for a startup and how to respond to it.

Karl Sims's 1994 demonstration of evolved virtual creatures: block-bodied creatures whose bodies and controllers are evolved through selection, mutation and recombination to swim, walk and compete.

Peter Norvig, then Director of Research at Google, talks at Startup School 2008 about leveraging large amounts of data and about technical challenges in Google projects such as image search. A central idea is that data can beat hand-written programming.

Top Gear segment in which Richard Hammond drives a Renault R25 Formula 1 car around Silverstone for two laps. He struggles with the car's demands.

Top Gear segment in which Hammond and May try to turn a Reliant Robin into a space shuttle. Launching is easy, but landing it safely is the problem.

A 2000 IBM commercial in which Avery Brooks complains that we still have no flying cars. It plays on the failed futurist promises of the twentieth century.

A one-minute 2007 clip of Barack Obama, during his campaign, opposing warrantless wiretaps. It was later reposted with a campaign call to action.

A short clip from a lecture Q&A in which Richard Stallman appears to pick something off his foot and eat it.

A sketch from the British sitcom Yes, Prime Minister in which Jim Hacker and the chief scientific advisor discuss the logic of the nuclear deterrent.

The first lecture of Andrew Ng's Stanford CS229 Machine Learning course, giving an overview of the course. It introduces supervised and unsupervised learning, learning theory and reinforcement learning.

A 1930s Chevrolet training film explaining the principles and development of the differential gear. It builds the idea step by step from first principles to the finished mechanism.

Cliff Click of Azul Systems gives a Google Tech Talk on running Java business applications on a machine with about a thousand cores. He covers hardware and software codesign, including garbage collection hardware and the JIT.

Mike Rowe, host of Dirty Jobs, shares stories from messy real-world jobs in this TED talk. He argues that hard work has been unjustly degraded in society.

A short clip of Stephen Fry defending swearing as a rich and essential part of the English language and rejecting the idea that it is unnecessary.

James Howard Kunstler's TED talk argues that American public spaces and architecture have become unworthy of care, damaging civic life. He presents suburban sprawl and car-first design as failures of the common good.

A Hitachi promotional cartoon in the style of Schoolhouse Rock explaining perpendicular magnetic recording for hard drives.

The climactic lesson scene from the 1983 film WarGames, in which the computer learns that the only winning move in nuclear war is not to play. It includes the character entering zero players and the famous closing line.

Eben Moglen of the Software Freedom Conservancy speaks at the 2009 Law of the Commons Conference about free and open software as a model for a new intellectual commons. The talk covers the legal and social case for sharing knowledge.

A clip in which Eben Moglen tells how he grew up when software was freer and how his path crossed Richard Stallman's. He describes how they came to work together to make software free again.

A demonstration of the 1982 Xerox Star user interface, including its desktop, icons, documents, networking and printing. The uploader argues that Apple's later Lisa and Mac interfaces evolved from these ideas rather than copying them.

Short archival footage of a USMC KC-130F Hercules making unarrested landings and takeoffs on the USS Forrestal in 1963. It is the largest and heaviest aircraft to have landed on a carrier, and the tests were judged successful but too risky for routine use.

A short clip of Richard Stallman singing the free software song, recorded during a visit to Ecuador.

A 2007 parody mocking Microsoft's Surface touch table, made by SarcasticGamer.

A Red Dwarf clip where Kryten fixes a toaster and finds it to be the most annoying machine in the universe, endlessly offering toast.

A two-minute clip from 2008 in which Barack Obama states his position on same-sex marriage and civil unions. He says he supports civil unions rather than promoting same-sex marriage.

Second half of a demonstration of the 1982 Xerox Star user interface. It shows how the Star differed from the later Lisa and Mac interfaces, with strengths in networking and printing and little direct manipulation.

A Dutch parody commercial from the Groen Brothers for a supposed Star Wars style mosquito defense system. It mimics the style of infomercials with laser-armed anti-mosquito technology.

A sketch from the Seattle comedy show Almost Live! in which Pat Cashman plays a US Bell rep explaining the new 425 area code. It first aired in 1997.

Neil and Laura Westwood pitch their Magic Whiteboard, reusable static-cling whiteboard sheets, to the investors on the BBC's Dragons' Den and win 100,000 pounds of investment.

A 2007 Google Tech Talk introducing Polyworld, an artificial life simulator used to evolve artificial intelligence by designing worlds rather than minds. It presents results from ongoing attempts to evolve intelligent behavior.

An SNL skit featuring Tom Brady in a mock workplace training video on sexual harassment, where the difference between welcome and unwelcome advances depends on who makes them. It is a satirical sketch.

A dramatization of a hypothetical Soviet first strike that destroys US bombers and Minuteman missiles, filmed with US Air Force cooperation. It is a short version of the 1979 documentary First Strike.

Daniel Barenboim conducts the Chicago Symphony Orchestra in Elgar's Nimrod from the Enigma Variations, opening the 1997 season at Carnegie Hall in tribute to Sir Georg Solti.

A segment from Carl Sagan's original Cosmos explaining the fourth spatial dimension through analogy with a two-dimensional world and shadow projection.