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In 1876, Spanish officials arrested a common seaman stepping off a ship because they knew his face from a political cartoon. He was William Tweed, Boss Tweed of Tammany Hall, once the third largest landowner in New York City and the man accused of taking between 25 million and 200 million dollars from its taxpayers. This episode follows the chair maker's son, born on the Lower East Side in 1823, from the brawling volunteer fire company called the Big Six to the top of a political machine.

Tweed's method was to fill every choke point of city government with a loyalist: the mayor, the district attorney, judges, and the comptroller who kept the books closed. An 1870 city charter bought with bribes gave his ring direct control of the treasury, and a county courthouse ended up costing $13 million. Yet he also delivered coal and food to poor immigrants, funded Catholic schools and hospitals, and widened Broadway. The episode weighs the thief against the builder, then traces the freak accident, the leak, and the cartoons that ended it all.

• Tweed had a friendly judge certify him as an attorney with no legal training, so contractors could pay him exorbitant legal fees in place of open bribes.
• The courthouse cost almost twice what the United States paid for Alaska, and Tweed bought the marble quarry that supplied its stone.
• In January 1871 the county auditor who kept the secret books was kicked in the head by a horse during a sleigh ride. His replacement copied the ledgers and leaked them to the New York Times.
• Tweed begged associates to stop Thomas Nast's drawings in Harper's Weekly, saying his constituents could not read but could not help seeing the pictures.
• He escaped custody in December 1875, fled through Cuba to Spain, was hauled back, and died of pneumonia in the Ludlow Street jail in 1878 at age 55.

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A bloodhound named Nick Carter followed a trail that was 300 hours old in 1900, and in Oregon in 1954 another hound worked a 330-hour-old trail to find a missing family. This episode explains how a dog that looks like a sleepy cartoon outperforms any sensor. Nearly 300 million scent receptors do the processing, long ears sweep shed skin cells up from the ground, and the loose wrinkled skin known as the shawl holds those particles around the nose.

None of it is natural. The breed traces to the Saint-Hubert monastery in Belgium around AD 1000, where monks bred slow, silent hounds to work cold scent on a leash. King Charles IX mocked them as fit only for people with gout, yet in Britain they became sleuth hounds set on outlaws and border reivers. The episode also takes apart the polite claim that the name means a dog of noble blood, and counts the health cost of centuries of extreme breeding.

• Humans shed about 40,000 skin cells every minute, and the gases released as bacteria feed on those skin rafts are what a hound follows.
• The noble blood story was promoted by a 19th century French breeder selling to Victorian society. The name first appears in the 1330s and originally meant a hound that followed the blood of wounded game.
• Bloodhounds trail rather than track, following the drifting scent plume and cutting corners, and are trained to plant their paws on the chest of the person they find.
• A 2024 UK study put average lifespan at 9.3 years against 12.7 for purebred dogs, with bloat blamed for 34 percent of deaths in one survey and cancer for 27 percent.
• Knotty, Best in Show at Westminster in 2005, died in 2008 of a rattlesnake bite taken while placing himself between the snake and his owner.

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The black mamba is olive, khaki, or gunmetal, never black. Its name comes from the inky interior of its mouth, which it shows only as a last warning. This episode separates the legend from the biology of Africa's longest venomous snake, an animal that averages two to three meters, weighs only a few pounds, tops out near 16 kilometers per hour, and returns to the same termite mound or rock crevice day after day. In the wild it seldom lets a human within 40 meters before fleeing.

The danger is real all the same. A cornered mamba can lift 40 percent of its body off the ground and deliver rapid, repeated bites, and its venom works without the swelling and tissue damage most people expect from a snakebite. Dendrotoxins overexcite the nervous system, alpha neurotoxins then block its signals, and collapse can follow within 45 minutes. The episode walks through fatal and survived bites, the puzzle of the dry bite, and a discovery that may turn this venom into medicine.

• Mongooses and honey badgers resist the venom because their muscle receptors have mutated so the alpha neurotoxins cannot bind.
• An average bite delivers over 100 milligrams of venom, while the lethal dose for a human is roughly 0.32 milligrams per kilogram of body weight.
• In 2008 a 28-year-old British trainee safari guide was bitten on the finger, felt almost nothing, sat through a lecture, and collapsed within the hour.
• A South African parks executive bitten in 1998 stayed calm, used a tourniquet, and still spent three days on a ventilator before recovering.
• Researchers decoding the venom in 2015 isolated mambalgins, peptides that relieve pain as strongly as morphine without respiratory depression, tolerance, or addiction.

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In late October 1921, a 67-year-old sports columnist finished a piece on boxing at the New York Morning Telegraph and died of a heart attack at his typewriter. He was Bat Masterson, born in Quebec in 1853, a former buffalo hunter who survived the five-day siege of Adobe Walls in 1874, took a bullet to the pelvis in Sweetwater, Texas, and walked with a cane for the rest of his life. This episode follows how a frontier survivor became a Manhattan celebrity.

Masterson won election as Ford County Sheriff by three votes, lost his brother Ed to a cowboy's bullet in April 1878, and then began treating his reputation as something he could sell. He worked as a hired gun in a Colorado railroad war, dealt faro in Tombstone beside Wyatt Earp, and helped stage the Dodge City Peace Commission, a show of force that never fired a shot. In 1902 he moved to New York, wrote three columns a week for nearly two decades, and befriended Theodore Roosevelt.

• In 1872 Masterson tracked a contractor who had skipped out on his wages for nearly a year, then took the $300 at gunpoint on a Dodge City train platform while a crowd cheered.
• At Adobe Walls, 28 buffalo hunters held off hundreds of Comanche, Kiowa, and Cheyenne warriors led by Quanah Parker, thanks to long-range Sharps rifles and thick mud walls.
• He ran for sheriff against the same 315-pound city marshal he had grappled with in the street months earlier, and won.
• On his second day in New York he was arrested for carrying a concealed weapon, paid a $10 fine, and complained about the mush-headed police.
• Roughly 500 people attended his funeral, where Damon Runyon gave the eulogy, and his gravestone in the Bronx reads: Loved by everyone.

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In November 1934, a woman named Helen left her husband's bullet-riddled body beside an Illinois cemetery, wrapped in a blanket because he always hated being cold. The dead man was Lester Joseph Gillis, known to the press as Baby Face Nelson and to his friends simply as Jimmy. This episode traces his path from a Chicago boy who shot a playmate in the jaw at age 12, through a gas station that fronted for tire thieves, to jewel robberies, a prison escape in 1932, and a crew of his own.

What set Nelson apart was volatility. He sprayed submachine gun fire at bystanders in Brainerd, Minnesota, shot a paint salesman dead over a traffic dispute, and carried a custom fully automatic .38 pistol against agents armed with six-shot revolvers. His gang financed John Dillinger's Crown Point escape, and the botched raid at Little Bohemia in April 1934 brought calls for J. Edgar Hoover to resign. The story ends near Barrington, Illinois, where a mortally wounded Nelson walked into gunfire and killed two more agents.

• The nickname came from the wife of Chicago Mayor Big Bill Thompson, who told the press the man who took $18,000 of her jewelry had a baby face.
• At Little Bohemia, agents opened fire on three innocent diners leaving in a Chevy coupe whose radio drowned out the warnings, killing one of them.
• Agent W. Carter Baum was shot at point-blank range by Nelson, and his weapon was later found with the safety catch still engaged.
• A punctured water pump on Nelson's stolen Ford V8 forced the final stand on November 27, 1934, where he absorbed nine bullets and still stole the agents' car.
• Agents Herman Hollis and Samuel Cowley both died from the Barrington firefight, and Nelson was dead that evening at age 25.

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Arsenic, element 33, has been an assassin's tool, a cosmetic, and a medicine, sometimes in the same era. The explanation starts on the periodic table, where it sits directly below phosphorus. The two elements bond in nearly identical ways, so cells that depend on phosphorus for DNA and energy let arsenic in by mistake. Once inside it cannot do the job, energy molecules fall apart, and the cell dies. The element is odd in other ways too: heated past 600 degrees Celsius it never melts but turns straight into toxic gas, and it can give off a strong smell of garlic.

This episode traces what people did with that chemistry. For centuries arsenic poisoning passed for cholera or dysentery and earned the name inheritance powder, until chemist James Marsh devised a test in the 1830s that made it traceable. Manufacturers then sold it as brilliant green dye for gowns, toys, sweets, and wallpaper. Modern medicine learned to aim the poison, from an early syphilis drug to a leukemia therapy, while millions today drink it unknowingly in groundwater.

• The Marsh test converts arsenic in a tissue sample into arsine gas, which leaves a silvery black mirror on heated glass.
• Napoleon, who died on St. Helena in 1821, likely lived among arsenic green wallpaper that fungi in the damp air converted into toxic gas.
• Hair analysis decades later showed that the Australian racehorse Phar Lap, who died in 1932, was killed by a massive arsenic overdose.
• In 2000 the FDA approved arsenic trioxide for a resistant form of acute promyelocytic leukemia, using it to trigger programmed cell death in cancer cells.
• People native to Chile's Atacama Desert carry a variant of the AS3MT gene that clears arsenic faster. A 2010 claim that a Mono Lake bacterium built its DNA with arsenic was refuted by 2012 and retracted in 2025.

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Arnold Rothstein, known as the Brain, built a criminal empire with arithmetic instead of muscle. Born in New York City in 1882 to an affluent family, he was the son of Abraham Rothstein, a businessman so upright he was called Abe the Just, and the brother of a future rabbi. Arnold hated school, loved numbers, and gambled from childhood despite his father's orders. By 1910, at 28, he ran his own casino in Manhattan's Tenderloin district, invested in a racetrack at Havre de Grace, Maryland, and paid for a network of informants. He was a millionaire by 30.

This episode explains how a man who despised leaving anything to chance moved from playing the odds to engineering outcomes. It covers his hidden hand in the Black Sox scandal, his recognition that Prohibition was a national market, and his role as banker and mediator to New York's gangs under the protection of Tammany Hall. It ends with the poker debt he refused to pay, the shooting at the Park Central Hotel on November 4, 1928, and the power vacuum that followed.

• Gamblers Sport Sullivan and Abe Attell each brought Rothstein a plan to bribe the White Sox. He hid behind layers of go-betweens and is estimated to have won about $350,000 betting on Cincinnati.
• Called before the Chicago grand jury, he posed as a wronged businessman and was never indicted. The grand jury records and signed player confessions later vanished.
• During Prohibition he bought freighters to import Scotch whisky and mentored Lucky Luciano and Meyer Lansky from his post outside Lindy's restaurant on Broadway.
• In late 1928 he lost more than $300,000 in a three day poker game with Titanic Thompson and Nate Raymond, claimed it was fixed, and stalled on paying.
• Dying in the hospital, he told detectives to stick to their trade and he would stick to his. F. Scott Fitzgerald modeled Meyer Wolfsheim in The Great Gatsby on him.

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Apollo Robbins once walked into the protective bubble around former President Jimmy Carter, chatted with the Secret Service agents on the detail, and came away with Carter's itinerary and the keys to the motorcade. He used no weapon and no gadget, only an understanding of how attention works. Born in 1974 in Plainview, Texas, Robbins was a soft-spoken child who wore leg braces and grew up with a father who was entirely blind. Kept from the playground, he learned to watch people closely, and he picked up his first sleight of hand from his two brothers.

This episode follows how that childhood produced a self-described gentleman thief whom Forbes called an artful manipulator of awareness. The central idea is that attention is not a floodlight but a laser pointer, and whoever steers it controls what a person perceives. Robbins turned the Carter stunt into a career teaching law enforcement, founded the consulting group Whizmob Inc. in 2006, started a training company with his wife, the magician and mentalist Ava Do, in 2012, and became a resource for neuroscientists and filmmakers alike.

• Robbins did not beat the agents with speed. A question or a squeeze of the shoulder floods the brain with input and masks the lighter touch of a hand in a pocket.
• After the motorcade incident, law enforcement agencies sought him out, and he visited prisons to learn directly from thieves, grifters, and con artists.
• Whizmob brought law enforcement officials and former convicts together as experts on current fraud, theft, and scams, with Robbins translating between the two sides.
• He appeared on Nova ScienceNow in 2011 and served as a consulting producer on National Geographic's Brain Games in 2013, giving researchers field evidence a quiet lab cannot supply.
• For the 2015 film Focus he taught Will Smith and Margot Robbie the craft of grifting, and he also advised a television heist series.

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Alvin Karpis did not die young in a hail of bullets like most Depression era outlaws. Born in Montreal in 1907 to Lithuanian immigrant parents and raised in Topeka, Kansas, he was running with gamblers and bootleggers by about age 10. Prison introduced him to Fred Barker, and after his release in 1931 the two formed the Barker-Karpis gang. Nicknamed Creepy for his smile, Karpis was the planner with a near photographic memory for bank layouts, escape routes, and police patrols, working out of the bribed safe haven of St. Paul, Minnesota.

This episode follows the gang from bank jobs to the kidnappings of brewer William Hamm and banker Edward Bremer, a crime that drew the anger of President Franklin D. Roosevelt and the full attention of the FBI. After 1934 wiped out Dillinger, Nelson, Floyd, and Bonnie and Clyde, Karpis was the last Public Enemy Number One. J. Edgar Hoover flew to New Orleans in May 1936 to claim the arrest. Karpis then spent 26 years on Alcatraz, met a young Charles Manson at McNeil Island, and died in Spain in August 1979 at 72.

• Karpis dismissed the legend of Ma Barker as a criminal mastermind, saying the gang sent her to the movies while they planned jobs. The FBI promoted the myth after agents killed her in a shootout.
• The Hamm kidnapping in 1933 brought a ransom of $100,000 and the Bremer kidnapping doubled it to $200,000, but Bremer's father was a personal friend of the president.
• In 1934 Karpis paid underworld doctor Joseph Moran to cut away his fingerprints, a mutilation that later made it hard for him to get a passport.
• Hoover claimed he grabbed Karpis before he could reach a rifle in the back seat of a car that had no back seat. None of the agents had handcuffs, so Karpis was tied with a necktie.
• At McNeil Island Karpis taught Charles Manson to play guitar, then refused when Manson begged for introductions to his contacts in Las Vegas.

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The African buffalo looks like a creature that should rule by force. A Cape buffalo bull can weigh up to 900 kilograms and carries a boss, a shield of fused bone across the forehead. Yet the herd is a matriarchy that settles its travel plans by something close to a vote. First described by the Swedish naturalist Anders Sparrman in 1779, Syncerus caffer is the only surviving species of its genus, split into four subspecies that range from the huge Cape buffalo of the open savanna to the small, reddish forest buffalo of about 265 kilograms.

This episode covers how the animal evolved, how it organizes itself, and how it shapes the land. Herds of a thousand or more break apart and rejoin with the seasons. Young males leave at four or five for bachelor groups, where rank is settled mostly by posture instead of combat. Feeding and ruminating fill 17 to 19 hours a day, and by mowing down tall, woody grasses the herds open the way for smaller grazers. The story also takes in the long contest with lions, the rinderpest catastrophe, and the buffalo's place in African art and myth.

• During rest periods, adult females stand, gaze in a chosen direction, and lie back down. The herd moves the way most of them pointed, and a split vote can divide it for a few days.
• Genetic evidence indicates the small forest buffalo is closer to the older lineage, so the armored giant of the savanna is the newer model.
• A buffalo eats up to 15 kilograms of grass a day and needs about 45 liters of water every 48 hours, which ties herds to permanent water.
• Lions cannot break a buffalo's neck, so a pride attacks from behind and suffocates it by clamping over the nose and mouth. Buffalo answer by backing into thorny thickets or mobbing the pride.
• Rinderpest, brought with European cattle in the 1890s, killed an estimated 95 percent of African buffalo. About 400,000 mature animals remain, and the species is listed as near threatened.