pplpod

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In 2007, David Karp and Marco Arment built Tumblr in a two-week gap between consulting contracts, and it gained 75,000 users in two weeks. By 2011, half its users were under 25. With no public follower counts and a tag field that people filled with rambling private commentary, it became a haven for niche communities, especially LGBTQ youth. In May 2013, Yahoo bought it for 1.1 billion dollars in cash. Six years later it sold for less than 3 million.

This episode traces how that value vanished. Yahoo bought an audience that mocked advertising and wrote down 712 million dollars by 2016. Verizon inherited the site in 2017 and, after Apple pulled the app from its store in late 2018, banned all adult content and handed enforcement to a crude algorithm. Traffic collapsed, Automattic picked up the remains in 2019, and the platform now loses 30 million dollars a year while its archive is sold as training data.

• Nearly 170,000 people signed a petition against the Yahoo sale, and users reblogged sponsored posts with sarcastic tags until the campaigns became jokes.
• The automated filter looked for skin tones and curves, so it flagged raw chicken, sand dunes, and a line drawing of a vomiting unicorn while real violations slipped through.
• By March 2019, Tumblr had lost an estimated 30 percent of its traffic.
• A 2022 settlement with the New York City Commission on Human Rights found the filter had disproportionately hit LGBTQ users and required algorithmic reviews.
• With more than half a billion blogs and roughly 172 billion posts, Tumblr began opting users into data sales to AI companies including Midjourney and OpenAI.

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The transistor is the most manufactured artifact in human history: by 2018, more than 13 sextillion had been made. It replaced the thermionic triode, a glass vacuum tube invented in 1907 that had to boil electrons off a heated plate, ran hot, and burned out like a light bulb. Physicist Julius Edgar Lilienfeld patented a solid-state alternative in Canada in 1925, but the pure semiconductor crystals needed to build it did not exist. The breakthrough came at Bell Labs in December 1947.

This episode explains how the device was invented, how it became microscopic, and how a speck of silicon does arithmetic. John Bardeen and Walter Brattain succeeded after William Shockley's first design failed, and the three shared the 1956 Nobel Prize in Physics. A furnace accident in 1955 then opened the way to printing transistors by the million. The story ends with the weaknesses of solid-state electronics and the places where vacuum tubes still win.

• Shockley's field-effect attempt was blocked by electrons trapped at the crystal surface, so Bardeen and Brattain pressed two gold point contacts directly onto germanium.
• Bell Labs engineer John R. Pierce coined the name by combining transfer and resistor. In France, Herbert Mataré and Heinrich Welker independently built a similar device in 1948 and called it the transistron.
• Carl Frosch and Lincoln Derick accidentally grew a silicon dioxide layer on a wafer in 1955, which led to photolithography and to the MOSFET, invented by Mohamed Atalla and Dawon Kahng in 1959.
• The MOSFET accounts for roughly 99.9 percent of all transistors, and a single Apple M3 Max chip holds about 92 billion.
• A cosmic ray can flip a transistor from zero to one, a single event upset, which is one reason tubes survive in broadcast transmitters, satellites, and guitar amplifiers.

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Before the transistor, a portable radio was a heavy box of hot, fragile vacuum tubes that needed two separate batteries, one just to heat the filaments. That changed after December 1947, when William Shockley, Walter Brattain, and John Bardeen demonstrated the first working transistor at Bell Laboratories. The first commercial transistor radio, the Regency TR-1, arrived in November 1954 from an unlikely partnership between Texas Instruments and an Indianapolis maker of TV antenna boosters. It cost 49.95 dollars and sounded thin and tinny.

This episode follows the pocket radio from costly novelty to cultural force. American firms proved the idea but could not make it cheap. Masaru Ibuka and Akio Morita could, paying 25,000 dollars for a license to the Bell Labs patent, building their components in house, and renaming their company Sony. Their TR-63 of 1957 arrived just as the baby boom, teenage spending money, and rock and roll converged, and it took music out of the family living room for good.

• Texas Instruments had a manufacturing yield of only 20 percent at launch, so four of every five transistors were thrown away, and the TR-1 used just four of them.
• The TR-63 was slightly too big for a shirt pocket, so Sony allegedly gave its salesmen custom shirts with oversized pockets. It also popularized the 9-volt battery.
• Prices fell to about 15 dollars by 1962, and by 1964 no transistor radio was built entirely from U.S. components.
• At night, AM signals from stations in the American South bounced off the ionosphere to Jamaica, where musicians reworked New Orleans rhythm and blues into ska and later reggae.
• As circuits shrank, radios turned into novelties shaped like a Jimmy Carter peanut, Charlie the Tuna, and the egg ship from Mork and Mindy.

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In 1991, a 13-year-old Tom Fulp cut and pasted together a fanzine about the Neo Geo console called New Ground and mailed it to about 100 members of a Prodigy club. By 1995 he had moved the idea online, and as a Drexel University student he began making crude games such as Club a Seal and Assassin. In 1999 he released Pico's School, a Flash game far more polished than the web of that era was used to, and gathered his scattered projects under a single domain with a page he called the Portal.

This episode treats Fulp's career as a history of the internet in miniature. When strangers began emailing him their own creations, he and a friend named Ross automated the Portal in 2000, creating an open stage for user-made animation and games years before YouTube. What followed was three decades of caretaking: community voting systems, media storms over violent games, a painful choice between free expression and compassion, and a rescue effort when Flash itself was shut off.

• Under the Judgment system, users rated submissions from zero to five stars, and anything below the threshold was blammed, deleted with only its reviews kept in a section called the obituary.
• Art and audio relied on scouting: an established user vouched for a newcomer and could lose that privilege if the newcomer broke the rules.
• After a 2007 torture game drew fire from NBC and Fox News, Fulp noted that the networks were airing footage of the game they condemned.
• In 2013, grieving parents contacted him about a Sandy Hook simulation, and he removed it, writing publicly that compassion had to outweigh his anti-censorship policy.
• As browsers dropped Flash by 2020, he sponsored Ruffle, an emulator written in Rust, and in 2021 he received a Pioneer Award from the Game Developers Choice Awards.

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The Pirate Bay began in late 2003 as a project of Piratbyrån, a Swedish anti-copyright think tank whose name means the Piracy Bureau. Its founders, Fredrik Neij, Gottfrid Svartholm, and Peter Sunde, described it as a long-running piece of performance art. The site hosted no movies or music at all. Using the BitTorrent protocol, it worked like a card catalog for an empty library, pointing users to one another's files. Early servers and bandwidth were paid for in part by Carl Lundström, heir to a crispbread fortune.

This episode follows the site through police raids, a landmark trial, and prison terms that failed to shut it down. Each attempt to kill it taught the operators a new way to survive: backup servers, a rotating set of international domains, a nuclear bunker in a Swedish mountain, and finally a switch to magnet links that made the whole database small enough for a thumb drive. It is a case study in what happens when border-based law meets a borderless network.

• Swedish police seized the servers in Stockholm on May 31, 2006. The site returned in three days with a logo of a pirate ship firing cannonballs at the Hollywood sign.
• An April Fools' post a month earlier had claimed a takedown, so many users assumed the real raid was a recycled joke.
• Publicity from the raid lifted registered users from about 1 million to 2.7 million.
• In the 2009 trial the founders were convicted of assisting copyright infringement, sentenced to a year in prison each, and later saw damages raised to 46 million kronor.
• The operators once tried to buy Sealand, a micronation on a World War II platform in the North Sea, and added a category for 3D-printable objects.

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Around 1990, German researcher Karlheinz Brandenburg sat in a lab listening to Suzanne Vega's a cappella recording of Tom's Diner thousands of times. He was tuning an algorithm built on a quirk of human hearing called auditory masking, first documented in 1894 by physicist Alfred M. Mayer: a loud tone makes a quieter neighboring tone inaudible. Brandenburg's idea, finalized in his 1989 doctoral thesis, was that a computer need not store sounds the brain throws away.

This episode traces the MP3 from that biological insight to worldwide disruption. At the Fraunhofer Institute, Brandenburg and a team known as the original six turned the theory into working code, then watched a standards committee reject it as too demanding for early 1990s hardware. The compromise that followed became MPEG-1 Audio Layer 3. Fraunhofer planned to license it to broadcasters. A hacker, a leaked encoder, Winamp, and Napster had other plans.

• A lone voice exposes compression flaws that a dense symphony would hide, and Tom's Diner produced a ghostly spatial artifact that took endless tweaking to remove. Brandenburg called Vega the mother of the MP3.
• The team's codec, ASPEC, was merged with the simpler, hardware-friendly Musicam standard to win approval from the Moving Picture Experts Group.
• The .mp3 file extension was settled on July 14, 1995. Before that, the files used the extension .bit.
• A hacker in the Netherlands called SoloH found the reference encoder's source code unprotected on a university FTP server and released it with a point-and-click interface.
• The format outlasted Sony's ATRAC and Microsoft's Windows Media Audio, and its last foundational U.S. patents expired in April 2017.

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Stuxnet was the first malware found to spy on and sabotage industrial control systems, and the first to carry a rootkit for a programmable logic controller. It surfaced in June 2010 after a programming error in an update let it spread from an engineer's laptop to the open internet, where a researcher at the Belarusian antivirus firm VirusBlokAda flagged it. At half a megabyte, it was enormous for malware. It used four zero-day exploits at once and drivers signed with keys stolen from Realtek and JMicron.

This episode explains how lines of code caused physical destruction at the Natanz enrichment facility in Iran. The worm infected more than 200,000 computers but stayed inert unless it found Siemens Step 7 software running motors at 807 to 1210 hertz, the speeds of gas centrifuges. Reporting cited here attributes it to a joint United States and Israeli program code-named Operation Olympic Games, though neither government has openly admitted building it.

• Because the target network was air-gapped, the worm traveled on USB drives, limited itself to three further machines per infected computer, and was set to erase itself on June 24, 2012.
• It pushed centrifuge rotors to 1410 hertz, dropped them to 2 hertz, then returned to normal and waited weeks before repeating the cycle.
• A man-in-the-middle trick recorded 21 seconds of normal sensor data and replayed it to control room monitors while the machines tore themselves apart.
• Roughly 1,000 centrifuges were degraded or destroyed, almost one-fifth of Iran's fleet at the time.
• Iran built up its own cyber forces in response, and later attacks included Operation Ababil against U.S. banks and the 2012 Shamoon wipe of Saudi Aramco computers.

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In February 1981, Steve Wozniak crashed a small plane shortly after takeoff from a California airport and woke with anterograde amnesia. For five weeks his brain could not form new memories, and he did not know his own name. He recovered in part by playing games on the Apple II, the computer he had designed. When his memory returned, he looked at his wealth and the corporate grind at Apple and stepped away, re-enrolling at UC Berkeley under the alias Rocky Raccoon Clark to finish his engineering degree.

This episode follows Wozniak from a childhood shaped by a Lockheed engineer father and Tom Swift Jr. books to the Homebrew Computer Club, where he built the Apple I to impress fellow hobbyists. It examines his partnership with Steve Jobs, one man supplying technical miracles and the other the means to sell them, and his lifelong fight for open machines that owners can modify and repair, from eight expansion slots on the Apple II to the right to repair movement.

• As a phone phreak known as Berkeley Blue, Wozniak built blue boxes that used a 2600 hertz tone to command the phone network, and Jobs turned them into a product.
• For Atari's Breakout he cut 50 chips from the design. Jobs collected a 5,000 dollar bonus, told him it was 700, and handed over 350.
• He offered the Apple I design to Hewlett-Packard five times and was turned down each time. Its retail price of 666.66 dollars came from his fondness for repeating digits.
• He produced color on the Apple II with a one dollar chip by timing processor pulses to match the television's color burst signal.
• When Jobs denied stock options to early employees, Wozniak gave them 10 million dollars of his own shares, and he later taught computing to fifth through ninth graders.

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In 1964, DuPont chemist Stephanie Kwolek produced a polymer solution that looked like a failure. It was thin, cloudy, and reminded her of buttermilk, the kind of mixture standard practice sent down the drain. She kept it. Stirring revealed an odd opalescence, a sign that the rigid aramid molecules had lined up in a liquid crystal state. The technician who ran the spinneret, Charles Smullen, refused to test it for fear of clogging his equipment, until she talked him into it. The fiber that emerged would not snap.

This episode follows Kwolek from New Kensington, Pennsylvania, where she was born in 1923 to Polish immigrant parents, to a 40-year career at DuPont that began as a temporary job to pay for medical school. A naturalist father taught her careful observation and a seamstress mother taught her how fibers bear a load. Together those lessons led to Kevlar, a material five times stronger than steel by weight that DuPont introduced commercially in 1971.

• At her 1946 DuPont interview in Buffalo, she demanded an immediate answer, citing a competing offer, and the offer letter was dictated on the spot.
• Her nylon rope trick showed that polymer could form at room temperature where two unmixable liquids meet, letting a continuous thread be pulled from a beaker.
• Kevlar's strength comes from molecules aligned in parallel, like uncooked spaghetti in a bundle instead of a tangled cooked bowl.
• She signed the patent over to DuPont and earned a salary and pension while the company made billions from more than 200 applications.
• The one millionth bullet-resistant vest made with Kevlar was sold the week she died in 2014 at age 90, after retirement years spent teaching chemistry to schoolchildren.

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In 1976, a small team at Texas Instruments led by Paul Breedlove began a side project with a budget of just 25,000 dollars. Two years later, at the Summer Consumer Electronics Show in 1978, they unveiled the Speak and Spell, the first educational toy to store whole spoken words in solid state memory with no moving parts. Earlier talking toys relied on tiny phonograph records and tape loops. This one ran on the TMC0280, the world's first single-chip voice synthesizer.

This episode explains the engineering behind that red and yellow box and follows its strange afterlife. Instead of storing recordings, the chip modeled the human vocal tract using linear predictive coding, squeezing speech down to about 1,000 bits per second. The same technology later warned Chrysler drivers that a door was ajar, helped E.T. phone home, and gave electronic musicians a machine they could deliberately break to produce new sounds.

• The original voice belonged to Mitch Carr, a radio anchor at KRLD in Dallas, and engineers spent days hand-editing the data phoneme by phoneme to make single words intelligible.
• A slot in the battery compartment took expansion cartridges such as Vowel Power and Super Stumpers, and a Secret Code game encrypted words with a Caesar cipher.
• Foreign versions were recorded near Nice, France, then processed in Dallas, and the cartridges were not region-locked, so a French module worked in an American unit.
• A 2019 revival by Basic Fun dropped the cartridge slot and the real synthesizer, using prerecorded audio filtered to sound robotic.
• Circuit benders rewire vintage units to jam the keyboard matrix, and Depeche Mode named their 1981 debut album Speak and Spell.