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In 1989, MIT engineer Joe Jones built a robotic vacuum out of Lego bricks and nicknamed it Dust Puppy. Corporate America wanted nothing to do with it. Denning Mobile Robot Company said no, Bissell passed, and the idea stalled for a decade until S.C. Johnson funded development through a young company called iRobot in 1999, then pulled out just before manufacturing. iRobot pressed on alone, renamed the machine Roomba, and launched it in September 2002 with three buttons for room size.

This episode follows the Roomba from an insect-brained gadget that pinballed around living rooms to a camera-guided, self-emptying system. Along the way come the random walk algorithm inspired by Rodney Brooks, the infamous pet waste disasters that forced a rethink of navigation, black carpets mistaken for cliffs, and a hacker community that iRobot chose to embrace instead of sue. It is the story of how a vacuum taught people to share their homes with autonomous machines.

• The first Roomba mapped nothing. It spiraled outward, followed walls, and bounced off furniture at random angles, a cheap approach that beat pricey sonar rivals like the Electrolux Trilobite.
• Total floor coverage had a dark side: a Roomba that met a dog accident would spread it across the whole house, an event the internet dubbed the Poopocalypse.
• The 900 series in 2015 added VSLAM, pairing a floor-tracking infrared sensor with an upward camera that used ceiling landmarks to correct drift.
• Infrared cliff sensors kept robots off the stairs but read dark rugs as a bottomless drop, so early machines refused to clean black carpet.
• After hobbyists tapped a hidden serial port for light painting and mapping projects, iRobot released the Create, a Roomba with the vacuum removed and a cargo bay in its place.

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In the late 1940s, a Grinnell College student stole a 25-pound pig for a campus luau. The farm belonged to the mayor, and Robert Noyce faced expulsion, a felony charge, and at least a year in state prison. His physics professor, Grant Gale, paid for the pig and negotiated a one-semester suspension. When Noyce returned, Gale showed him two of the first transistors from Bell Labs. This episode follows the minister's son from Burlington, Iowa, born in 1927, from that moment to MIT and on to California.

There he worked for transistor co-inventor William Shockley, a brilliant scientist and oppressive manager. In 1957 Noyce and seven colleagues walked out, earned the name the Traitorous Eight, and started Fairchild Semiconductor. In 1959 he invented the monolithic integrated circuit, printing flat aluminum connections on silicon. In 1968 he and Gordon Moore founded Intel, where his flat, open culture became the model for the modern startup.

• At five he beat his father at ping pong and was insulted when his mother suggested his dad had let him win.
• At 12 he and his brother built a boy-sized aircraft and launched it from the roof of the college stables, and at Grinnell he won the Brown Derby Prize for the best grades with the least work.
• Jack Kilby of Texas Instruments built an integrated circuit first in 1958, but it relied on tiny gold wires, while Noyce's planar design could be mass produced.
• At Intel there were no reserved parking spaces, corporate jets, or corner offices, and Noyce sat in an open cubicle, a setup meant to speed the flow of ideas.
• Asked what he would do as emperor of the United States, he named education for the poorest as his top priority. He died of a heart attack in Austin, Texas, in 1990 at age 62.

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In 1987, a 21-year-old Rick Astley released a debut single that hit number one in the US, the UK, and Australia, its booming baritone at odds with the boyish singer shuffling in a trench coat. The video was shot in a week, and he wore his own clothes. By 1994, worn down by the pop machine, he retired at 28 to raise his family. This episode tells what happened next: 14 quiet years, then a bait-and-switch prank that made him the most famous person online without his doing a thing.

The prank grew out of a 2006 message board joke called duckrolling. In May 2007, as fans hunted for the crashed Grand Theft Auto IV trailer, a 19-year-old US Air Force airman in South Korea posted Astley's video under the trailer's name. Astley was annoyed at first, until his daughter explained that the joke was on the person who clicked, not on him. He joined in, and the choice led to a number one album in 2016 and festival stages by 2023.

• The airman picked the song only because he was looking at hits from 1987, the year he was born.
• In late 2008 the internet flooded a European music award poll with roughly 100 million votes for Astley, and he later sprang the prank himself from a parade float on live television.
• Because he did not write the song, Astley had reportedly earned just $12 in performance royalties from the video platform by 2010.
• In 2015 hackers flooded the channels and hashtags of terror groups with the video, and a rock band brought Astley on stage in Tokyo to sing it over a grunge anthem.
• A 12-year-old pranked Astley with his own song in 2020, and the original video passed 1 billion views in 2021.

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On a train in the American West, engineer Herman Hollerith watched a conductor punch holes in a ticket to record a passenger's hair color, height, and nose, a trick used to stop ticket fraud. Hollerith saw something bigger: if holes could describe a person, a standardized card could encode any statistical fact. This episode follows that idea to the 1890 United States Census, which faced a crisis after the 1880 count took nearly eight years to tabulate by hand.

His electromechanical system used spring-loaded pins that passed through each hole into cups of mercury, closing a circuit that advanced a dial and popped open a sorting box. In 1896 he founded the Tabulating Machine Company, which merged into CTR in 1911 and was renamed IBM in 1924 under Thomas J. Watson Sr. The episode covers the antitrust fight over IBM's card sales, the shift to 80 columns, and the card's long afterlife in computing.

• Punched paper controlled looms long before Hollerith: Basile Bouchon used it in 1725 and Joseph Marie Jacquard perfected the idea around 1804.
• Hollerith's card measured 3.25 by 7.38 inches, the size of American paper currency of the time, so it would fit cabinets and trays built for cash.
• IBM leased its machines and required customers to buy its cards until it lost at the Supreme Court in 1936, which let others sell cards built to IBM's specifications.
• In 1928 IBM switched to narrow rectangular holes that fit 80 columns on a card, the reason many terminal windows still default to 80 characters wide.
• The warning do not fold, spindle, or mutilate became a protest slogan during the 1964 Free Speech Movement at Berkeley.

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You read a post so outrageous you cannot tell whether its author is a sincere fanatic or a deadpan comedian. That confusion has a name. In 2005, during a heated argument about creationism on a Christian forum, a user called Nathan Poe observed that without a blatant display of humor, no parody of a creationist could avoid being taken by someone as the real thing. This episode traces Poe's Law from that single post to a rule that applies to every form of extremism online.

The problem is older than the forum. In 1983, Usenet etiquette guide Jerry Schwartz warned that text lacks voice inflection and body language, and recommended a sideways smiley face to flag jokes. The episode then turns darker: by 2017, Wired called Poe's Law the most important internet phenomenon of the year, as deliberate ambiguity became a refuge for people testing extreme ideas and retreating to a claim of satire when challenged.

• Extreme beliefs already sound absurd to outsiders, so parody and sincere conviction end up sharing the same vocabulary, and confirmation bias does the rest.
• Examples include the OK hand gesture adopted on 4chan and Trump administration statements that left the press debating whether they were policy or jokes.
• Content moderation algorithms struggle with satire and reward engagement, so the joke framing can carry radical ideas past the filters like a Trojan horse.
• Some theorists file the law under kitsch culture, while others warn that constant unresolved irony is a pipeline to nihilism.
• In 2025 philosopher Jack Russell Weinstein added two variations: fierce advocacy becomes indistinguishable from trolling, and online, apathy cannot be told apart from resignation.

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On July 15, 2020, the Twitter accounts of Barack Obama, Elon Musk, Joe Biden, and Apple all promised to double any Bitcoin sent their way. The mastermind was a 17-year-old who broke no encryption. He and his accomplices phoned Twitter employees working from home, posed as the IT help desk, and sent them to a fake VPN site, netting about $117,000. This episode uses that breach to explain phishing as a hack of human psychology, delivered by email, phone calls, text messages, and now QR codes.

The history runs from America Online in 1995, where users posed as staff to collect passwords, through the Russian Business Network and the 2013 Target breach, to the state-backed group Fancy Bear. Then comes the present arms race. Language models write flawless lures for about three cents each, subscription kits let anyone launch a campaign, and adversary-in-the-middle attacks relay login codes in real time to steal session cookies. The strongest answer so far is the passkey.

• In a study of 1,876 participants, statistically none could identify a malicious QR code, and scammers in the UK have stuck fake codes over real ones on car park payment machines.
• US computer users lost around $929 million to phishing in a single year in the mid-2000s, and in 2006 the Russian Business Network was tied to almost half of all phishing thefts.
• Attackers reached Target's 110 million customer and card records by spear phishing an HVAC subcontractor with network access.
• A 2024 study found the mandatory training shown after a failed phishing test does not improve behavior, though periodic reminders that tests exist do help.
• Passkeys tie the cryptographic signature to the real domain, so a spoofed site gets nothing an attacker can intercept or relay.

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The first telephone pager system was patented in 1949 by Al Gross, and the first practical service launched in 1950 for doctors in the New York City area. The device weighed 200 grams, cost $12 a month, and reached 40 kilometers from a single tower. It could only buzz, and physicians hated it, because it invented the condition of being permanently on call. This episode follows the pager from that start through Motorola's transistorized model, the Bellboy shown at the 1962 Seattle World's Fair, and its cheap, citywide networks of the 1990s.

Pagers became a status symbol in hip hop, a tool of the drug trade, and the source of numeric codes like 143 for I love you. When texting killed the consumer market, the technology survived on physics: a pager transmitter puts out a thousand watts against a cell phone's 0.6, and its one-way simulcast broadcast cannot be overloaded. That same passive design explains why Hezbollah adopted pagers to avoid tracking, and how thousands of them were detonated in September 2024.

• The Bellboy used three tiny reed relays, each tuned to one of 33 frequencies, and buzzed only when all three vibrated at once.
• By 1996 Japan alone had over 10 million active pagers, and A Tribe Called Quest, Sir Mix-a-Lot, and Destiny's Child all put them in songs.
• A Miami-Dade schools official called pagers the most dominant symbol of the drug trade, and schools across the country banned them.
• During the 2005 London bombings the two-way TETRA radio system overloaded while paging networks kept delivering, and in 2017 the NHS still ran 130,000 pagers.
• Because the network cannot locate a one-way pager, it broadcasts every message unencrypted from every transmitter, which hides the user's location but exposes the message.

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In April 2011, Christopher Torres, a 25-year-old artist in Dallas, Texas, was taking drawing requests during a charity livestream for the Red Cross. One viewer asked for a Pop-Tart, another for a cat. He merged them, then animated the result flying through space with a rainbow trail, partly as a tribute to his Russian Blue, Marty. Days later a YouTube user paired his loop with a Japanese song made of a synthesized voice repeating the sound of a meow and titled the upload Nyan Cat. Torres had called his creation Pop-Tart Cat.

This episode uses that accident to ask who owns a meme. The video became the fifth most viewed on YouTube that year and spread into games, a Windows progress bar, and a cryptocurrency called Nyancoin. Torres registered copyrights and trademarks, reclaimed a hijacked domain, and joined Keyboard Cat creator Charles Schmidt in suing Warner Bros. over the game Scribblenauts. A decade after the doodle, he sold a remastered version as an NFT for 300 ether.

• The song began on the Japanese site Niconico in July 2010, built with Hatsune Miku Vocaloid software, and the viral video used a later cover made with the UTAU program.
• Torres accepted the name the internet gave his character instead of fighting it.
• US trademark law obliged Torres to defend his mark or risk losing it, and Warner Bros. and developer 5th Cell settled in September 2013.
• The February 2021 NFT sale brought roughly $587,000 for verified ownership of the artist's official copy, not the copyright.
• In March 2019 the YouTube channel hosting the original viral upload passed to Means TV, a worker-owned streaming cooperative.

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In November 1992 there were exactly 26 websites in the world. By August 1995 there were more than 10,000. The difference was NCSA Mosaic, a browser begun in December 1992 by Marc Andreessen and Eric Bina at the University of Illinois at Urbana-Champaign, in a lab funded through the High Performance Computing Act of 1991. Mosaic was not the first graphical browser, but it was the first to place images inline with text on the same page, and by September 1993 it ran on Windows and the Macintosh.

This episode treats the software like a biography subject, from birth to early death. Version 2.0 added HTML forms in November 1993, turning the web from a read-only library into a two-way medium and laying the ground for online commerce. Then the commercial potential it revealed destroyed it. Andreessen left to co-found Netscape, Microsoft licensed a Mosaic descendant to build Internet Explorer, and NCSA ended development in January 1997.

• Before Mosaic, the internet meant text tools like Archie, Gopher, and WAIS, and clicking an image link opened it in a separate program.
• Some academic purists hated inline images, seeing them as frivolous decoration that turned a serious research network into a glossy brochure.
• Netscape Navigator displayed text while images were still loading, and its internal code name, Mozilla, stood for Mosaic Killer.
• Mosaic was never open source: NCSA licensed it to Spyglass, which rewrote the browser from scratch and then licensed that code to Microsoft.
• Microsoft paid Spyglass a $2 million fee plus a share of browser revenue, gave Internet Explorer away for free, and later settled the resulting dispute for $8 million.

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On June 26, 1974, a cashier at a Marsh supermarket in Troy, Ohio, scanned a 10-pack of Wrigley's Juicy Fruit gum. That beep ended a 20-year struggle. It began in 1948 at the Drexel Institute of Technology, where graduate student Bernard Silver overheard a food chain president begging for automated checkout. Silver and Norman Joseph Woodland first tried ultraviolet ink, which was costly and faded. Then Woodland, sitting on a Florida beach, drew Morse code in the sand and pulled the dots and dashes down into thick and thin lines.

This episode follows the idea through every near failure. Woodland's first reader paired a 500 watt bulb with a movie projector's sound technology, and IBM judged the concept decades ahead of affordable computing. David Collins tried colored stripes on railroad cars, lost to mud and grime, and turned to lasers. IBM's George Laurer then replaced the circular bullseye design with vertical stripes, and a military mandate finally forced manufacturers to print the codes.

• The original 1952 patent showed a bullseye of concentric rings so a cashier could scan an item from any angle.
• The railroads' KarTrak system was made the mandatory industry standard in 1967 and abandoned by the late 1970s because dirt blinded the scanners.
• RCA's bullseye failed in an 18-month Kroger test in Cincinnati because fast printing presses smeared the rings, while smearing only makes vertical bars taller.
• In 1976 Businessweek ran a piece titled The Supermarket Scanner That Failed, as stores and manufacturers each waited for the other to commit first.
• Barcodes set off a 1970s panic, with Phil Donahue calling them a corporate plot and some religious groups linking them to the number of the beast.