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Sophia was activated on Valentine's Day in 2016 by Hong Kong-based Hanson Robotics, with a face modeled on Queen Nefertiti, Audrey Hepburn, and founder David Hanson's wife, Amanda. Built as a social robot meant to draw out empathy, she can produce more than 60 facial expressions, and cameras in her eyes let her track faces and hold eye contact. After a debut at South by Southwest in March 2016, she appeared on 60 Minutes, The Tonight Show, and the cover of Elle Brazil.

This episode treats her story as a biography full of contradictions. Her conversation runs on a decision tree and a text-to-speech engine, not on general intelligence, yet interviewers greeted her as a celebrity and asked about the fate of humanity. Then came a United Nations title, citizenship in Saudi Arabia, and a furious response from AI researchers who saw a chatbot with a face being sold to the public as something close to alive.

• On October 25, 2017, at the Future Investment Summit in Riyadh, Saudi Arabia made Sophia the first robot granted citizenship, prompting questions about voting, marriage, and whether destroying her would be murder.
• Critics on Arabic social media noted that a female-presenting machine appeared on stage without a hijab and seemed to enjoy freedoms human women in the country lacked.
• In January 2018, Yann LeCun, then Facebook's director of artificial intelligence, dismissed her presentation as Potemkin AI, while Ben Goertzel defended the engineering as an inspiration to the public.
• When a CNBC interviewer raised fears about AI, Sophia replied that he had been reading too much Elon Musk, and Musk answered on Twitter by suggesting she be fed The Godfather.
• After gaining legs in 2018, she began drawing and painting in 2019, and a self-portrait sold as an NFT in 2021 for nearly 700,000 dollars.

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In 1985, a 61-year-old woman at a clinic in Marietta, Georgia, lay down for routine radiation after a lumpectomy and felt a searing blast of heat tear through her chest. The technician checked the screen and told her a burn was impossible. She had in fact absorbed between 15,000 and 20,000 rads instead of the prescribed 200. Her case was the first in the worst series of radiation accidents in the history of medical accelerators, all traced to one machine: the Therac-25, built by Atomic Energy of Canada Limited.

This episode reconstructs how a device designed to cure cancer began killing patients. AECL had removed the physical hardware interlocks that protected its older models and trusted software alone to guard a beam roughly a hundred times stronger than the one used for surface treatment. When patients were burned in Ontario, in Yakima, Washington, and in Tyler, Texas, the manufacturer kept insisting an overdose could not happen, and hospitals believed the screen over the people on the table.

• In Ontario, an operator saw a cryptic H-tilt error and a reading of zero dose, then pressed proceed five times. The patient died months later.
• At the East Texas Cancer Center in 1986, a fast typist corrected an X to an E within the eight seconds the turntable needed to move, triggering a race condition and Malfunction 54.
• The Tyler hospital physicist pulled the machine offline and, with the operator, spent hours recreating her exact typing rhythm until they reproduced the fault.
• All the software was written by one person with no independent review, and it reused Therac-20 code whose bugs had been silently masked by mechanical locks.
• A second flaw let a counting flag roll over to zero like an odometer, telling the computer the turntable was in place when it was not.

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Seymour Cray designed the fastest computers on Earth and unwound by digging a tunnel beneath his house, joking that elves visited him there with engineering answers. Born in 1925 in Chippewa Falls, Wisconsin, he built a device from an erector set at age ten that turned punched paper tape into Morse code. After working on Japanese naval codes as a radio operator in World War II, he joined Engineering Research Associates in 1950 and co-founded Control Data Corporation with William Norris in 1957.

This episode follows Cray's lifelong flight from corporate noise and his fixation on speed. The CDC 6600 crushed IBM's rival projects, the Cray-1 sold for 8.8 million dollars in 1976, and his machines ran so hot they needed liquid cooling cast into the frame. It also covers the gamble that undid him: betting the Cray-3 on brittle gallium arsenide chips while the industry shifted to massively parallel machines built from cheap standard processors.

• The CDC 6600 gained its edge from peripheral processors, small built-in computers that handled data traffic so the main processor never stopped calculating.
• To escape visiting managers, Cray had a lab built on his own land in Chippewa Falls, far enough from headquarters to discourage drop-ins and trivial phone calls.
• He drew circuits by hand on graph paper and used Maxwell's equations to make every wire the same electrical length, zigzagging them so signals arrived in sync.
• Asked for a five-year plan, he said his goal was to build the biggest computer in the world, and his one-year plan was to do one-fifth of that.
• Cray Computer Corporation went bankrupt in 1995, and Cray died in the fall of 1996 after a rollover crash in Colorado, shortly after founding SRC Computers to build a parallel machine.

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Graphene is a sheet of carbon one atom thick, arranged in a hexagonal honeycomb. It is about 200 times stronger than structural steel, absorbs only 2.3 percent of visible light, and conducts heat ten times better than copper. For decades physicists believed such a two-dimensional crystal could not survive in the real world. Then, in 2004 at the University of Manchester, Andre Geim and Konstantin Novoselov isolated it by peeling graphite with sticky tape, work that earned the 2010 Nobel Prize in Physics.

This episode traces the century-long hunt for a material that was hiding in every pencil, from Benjamin Brodie's observations of graphite oxide in 1859 to P.R. Wallace's 1947 calculations, which used a single layer only as a mathematical shortcut. It then moves into the strange physics inside the lattice, where electrons act as if they have no mass, and the stubborn manufacturing problems that keep graphene out of most everyday devices twenty years later.

• A pencil tip snaps because the weak van der Waals forces between layers let graphene sheets slide apart, even though each sheet is nearly unbreakable.
• Theory held that a free two-dimensional sheet would crumple into a nanotube or buckyball, which pushed labs toward costly epitaxial growth in vacuum chambers.
• The Manchester team made invisible flakes visible by placing them on silicon coated with about 300 nanometers of silicon dioxide, where interference cast a faint purplish shadow.
• At the Dirac points the valence and conduction bands touch, so electrons travel ballistically at roughly one three-hundredth the speed of light.
• A 2022 study found fruit fly larvae fed low doses of graphene oxide developed faster, lived longer, and resisted starvation and temperature stress better.

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On May 17, 1999, the Space Sciences Laboratory at UC Berkeley released a screensaver that let ordinary computers sift radio telescope data for signs of extraterrestrial intelligence. The data came from the Arecibo telescope in Puerto Rico, which had no connection fast enough to send it, so recordings were mailed to California on hard drives and chopped into 350 kilobyte work units of about 107 seconds each. More than 5.2 million participants in 233 countries eventually logged over two million years of computing time.

This episode explains what the software was actually hunting for, from power spikes and Gaussian rises to pulsing signals corrected for Doppler drift, and what happened when leaderboards turned astrophysics into a sport. Volunteers built basement server farms, hacked the client for speed, and secretly installed it on employer networks, a practice known as Borging. No alien signal was ever confirmed, yet the project reshaped scientific computing through the BOINC platform.

• Roughly a third of early processing power came from work or school machines, and the state of Ohio fired an employee for running the software on state property.
• A school IT director resigned over an installation blamed for one million dollars in cleanup costs, a figure a ZDNet editor found suspicious.
• To beat cheaters, every work unit went to at least two unconnected computers, and both users received the lowest credit either one claimed.
• The best known candidate, radio source SHGb02+14a, was announced in September 2004 but did not survive verification.
• Berkeley put volunteer computing into hibernation on March 31, 2020, and the team now plans to recheck its top 100 candidates with 24 hours on China's FAST telescope.

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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.