classical

A recording of Erik Satie's Gymnopedie No. 1, one of the best-known pieces of minimalist piano music by the French composer.

A full piano performance of Beethoven's Piano Sonata No. 14, the Moonlight Sonata, with all three movements: Adagio sostenuto, Allegretto and Presto agitato.

Colin Smith introduces Structure and Interpretation of Classical Mechanics and his Clojure port, sicmutils. He shows how higher-order functions and a symbolic algebra system can represent Lagrangian mechanics.

A short clip of a track from Emily Howell, a computer program by David Cope that composes classical-style music, performed by human players. It is a sample of algorithmic composition.

Organist Hans-Andre Stamm performs Bach's Toccata and Fugue in D minor, BWV 565, on the Trost organ in Waltershausen, Germany, an instrument from 1730. The video shows the playing and footwork.

Glenn Gould's 1955 recording of Bach's Goldberg Variations, uploaded as a continuous performance of about 39 minutes.

Yo-Yo Ma performs Bach's Cello Suite No. 1 in G Major at the BBC Proms in 2015. It is a full solo cello performance of the suite.

A full performance by cellist Mischa Maisky of Bach's Cello Suite No. 1 in G, from a 1993 Unitel recording, with all six movements.

Stephen Malinowski performs Bach's Little Fugue in G minor on organ, accompanied by an animated graphical score. Pedalboard playing carries one of the melodic lines.

A performance of Bach's Coffee Cantata (BWV 211) conducted by Ton Koopman, with English subtitles. It is a comic secular cantata about a father and his coffee-loving daughter.

A Sesame Street animation from 1979 with music composed by Philip Glass, showing geometric circle patterns.

A rap battle in which John Maynard Keynes and F. A. Hayek debate the causes of boom and bust, stimulus, and bailouts. It was produced by Econstories to teach the two schools of thought.

Andrew Ng presents unsupervised feature learning and deep learning, showing how algorithms can learn representations from unlabeled data instead of hand-designed features. He gives examples in vision and audio, including visualizations of features learned by successive layers.

PBS Space Time argues that the speed of light is better understood as the speed of causality, the universal limit on how fast cause and effect propagate. Light travels at that speed because it is massless, but the limit itself is a property of spacetime.

The first of Richard Feynman's 1964 Cornell Messenger Lectures, The Character of Physical Law, focusing on the law of gravitation. Feynman builds up from planetary motion to the nature of physical laws.

Emily Shea explains how repetitive strain injury pushed her to program by voice using speech recognition (Talon), and gives a live coding demo. She argues voice-driven development can be pain-free, efficient and enjoyable.

David Tong, a Cambridge theoretical physicist, explains at the Royal Institution that the fundamental building blocks of nature are quantum fields rather than particles. He covers what we know about these fields and how they fit into the Standard Model.

Veritasium explains magnetism as a consequence of special relativity. Length contraction of moving charges makes a current in a wire attract or repel a nearby moving charge.

Physicist Carlo Rovelli gives a public lecture at the Royal Institution on how our understanding of time has changed, from Boltzmann and Einstein to quantum theory and loop quantum gravity. He blends physics, philosophy and art to argue that time is stranger than everyday intuition suggests.

Martin Gorner's Devoxx talk introduces deep learning with TensorFlow, walking through neural networks for MNIST, how to choose an architecture and how to diagnose networks that fail to train.

A 1972 song by Adriano Celentano whose lyrics are nonsense syllables designed to sound like American English to non-English speakers. It is a rock and rap-flavored novelty track with a video.

Mike Pound explains the discrete cosine transform and how it underpins JPEG compression. It is part two of Computerphile's JPEG series.

A 1983 BBC interview in which Richard Feynman is asked how magnets work and explains why 'why' questions are hard to answer in everyday terms. He reflects on what counts as an explanation and the limits of analogy.

The complete six-stage album series Everywhere at the End of Time by The Caretaker, about 6.5 hours of music that depicts the progression of dementia through distorted, decaying old ballroom recordings.

A mashup that plays a Miles Davis improvisation video alongside an LCD Soundsystem clip with no editing, so the two seem to perform together. It also became known for an affectionate mouse cursor moving along.

A full performance of Steve Reich's Music for 18 Musicians by eighth blackbird with Third Coast Percussion and others, recorded in Chicago in 2011. It is an hour-long minimalist piece built on phasing and repeating patterns.

OK Go's music video for This Too Shall Pass, featuring a huge Rube Goldberg machine built in a warehouse in Los Angeles with Syyn Labs. The band interacts with the contraption in one continuous take.

Veritasium explains how trees lift water from roots to the top of tall trunks, using transpiration pull and the negative pressure that liquid water can sustain. It explains why trees do not need pumps or valves.

PBS Space Time explains Noether's theorem: conservation laws such as energy and momentum are consequences of deeper symmetries. It also covers why those laws hold only under certain conditions.

A short clip of Richard Feynman answering an interviewer's question about why magnets repel, explaining that a 'why' question depends on a shared framework of understanding. It illustrates how hard it is to explain fundamentals to a layperson.

Luis von Ahn, creator of CAPTCHA and reCAPTCHA, explains how small contributions from many people online can digitize books. He then introduces Duolingo as a way to translate the web while people learn languages.

Veritasium explains the effort to redefine the kilogram, which was still defined by a physical artifact, and how a near-perfect silicon sphere from the Avogadro project helps. It also covers the history of the unit's odd naming.

A short conference talk from !!Con 2017 in which Kevin Chen explains the HDR imaging algorithm from a foundational paper, framing it as a system of linear equations, and implements it in a Microsoft Excel spreadsheet. No prior image processing knowledge is needed.

Harvard Belfer Center lecture by Matthew Bunn explaining how nuclear bombs work, including fission and fusion weapons and which parts of bomb-making are hard. It is part 1 of 2 in the Nuclear 101 series.

Vox Earworm explains why John Coltrane's Giant Steps is so hard to improvise over: it is fast and moves through three keys. Musicians Braxton Cook and Adam Neely walk the host through the underlying music theory.

A PBS Space Time episode explaining how space and time swap roles inside a black hole's event horizon. It is part of the channel's black hole series.

Leo Dirac explains how transformer models have replaced LSTMs in NLP. He gives background from bag of words through RNNs and LSTMs, then a technical deep dive into multi-headed self-attention and positional encoding, with sample code.

Veritasium explains what a black hole should look like, using J.P. Luminet's 1979 work and a cardboard 3D model to show how light bends around it. It was made just as the first black hole image was released.

Physicist Geoffrey West speaks at an FQXi conference on time about complexity and scaling laws. He covers how metabolism, growth and lifespan scale across organisms and how the same mathematics applies to cities and companies.

Commander Chris Hadfield performs a revised version of David Bowie's Space Oddity, recorded aboard the International Space Station. It was released as a music video in 2013.