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At 12, Carl Jung was knocked down by a classmate and began fainting whenever he tried to study, staying home for six months until he overheard his father worrying about money and forced himself through a Latin grammar until the spells stopped. Born in 1875 to a Swiss Reformed pastor he saw as spiritually hollow and a mother who said spirits visited her at night, Jung felt split into personality number one, an ordinary schoolboy, and number two, a dignified man from the 18th century. He hid a carved mannequin in his pencil case in the attic, a ritual he later matched to soul stones and churingas.

At the Burghölzli hospital in Zurich under Eugen Bleuler, his timed word association tests revealed what he called complexes. His 1903 marriage to Emma Rauschenbach, heiress to the IWC watch company, gave him financial freedom. After a 13 hour first meeting in 1907, Sigmund Freud named him his crown prince and first president of the International Psychoanalytical Association, but they split by 1913 over the libido and the collective unconscious. Jung then recorded his visions in the Red Book, built a stone tower at Bollingen, and developed introversion, extroversion, the persona, the shadow, and the anima and animus.

• Why Freud wanted a Swiss Christian to protect psychoanalysis from being called a Jewish science
• The Kreuzlingen snub and Freud fainting during a meeting in Munich
• Synchronicity, which Jung kept teaching though his statistical experiments failed
• His advice to an alcoholic American businessman that helped inspire Alcoholics Anonymous
• The duality of man line in Stanley Kubrick's Full Metal Jacket

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On television, CPR revives patients about 75 percent of the time. In reality, survival after an adult cardiac arrest outside a hospital is closer to 10 percent. This episode explains what happens when the heart stops: brain damage begins in about four minutes and becomes irreversible after about seven. Chest compressions rarely restart the heart. Their purpose is to keep some oxygenated blood moving to the brain and heart until help arrives, at 100 to 120 compressions per minute with full recoil so the chambers can refill.

It took a long time to get here. In the 19th century the Silvester technique raised and lowered a patient's arms to work the lungs, and Holger Nielsen later pressed on the back of a patient lying face down. In the 1960s James Jude, Guy Knickerbocker, and Peter Safar combined chest compressions with mouth-to-mouth. In 2010 the American Heart Association changed ABC to CAB, and hands-only CPR is now recommended for bystanders when an adult collapses. The episode explains why children, drowning victims, and overdose victims still need rescue breaths, and why a defibrillator resets ventricular fibrillation but is never used on a flat line.

• Why a suddenly collapsed adult still has oxygen-rich blood waiting to be circulated
• Compressions five to six centimeters deep and why broken ribs are common
• Stayin' Alive at 104 beats per minute and Another One Bites the Dust at 110
• Bystander AED use raising survival to around 35 percent
• Animal trials of cardioplegic blood infusion after more than 70 minutes of arrest

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Some people wake from a head injury able to do things they never learned, a condition called acquired savant syndrome. This episode explains savant syndrome as extraordinary skill in one narrow area alongside a neurological, developmental, or intellectual impairment. Estimates put it at about one in a million people, with males diagnosed roughly six times as often as females, and fewer than 100 living people whose skills would stand out even in a neurotypical prodigy. The abilities cluster in art, arithmetic, music, spatial skills, and memory, with calendar calculation the most common.

About half of cases are linked to autism and half to injury or disease of the central nervous system, most often the left anterior temporal lobe, the brain's hub for concepts and language. Some older adults with frontotemporal dementia develop new artistic or musical abilities. Researchers have produced savant-like drawing and proofreading in healthy volunteers by suppressing that area with low-frequency transcranial magnetic stimulation. The episode traces the term from John Langdon Down's discarded label to savant syndrome and profiles Stephen Wiltshire and Temple Grandin.

• Why the 400 year cycle of the Gregorian calendar attracts so many savants
• The documented link between blindness, intellectual disability, and musical skill
• A 2012 study tying savant skills to higher scores on obsessions and special interests
• How Temple Grandin's visual thinking spotted shadows and reflections that panicked cattle
• Therapies that aim to reduce distress without suppressing the skill

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Body snatchers did not steal watches or rings. They stole the corpse and tossed the burial clothes back into the grave, because under common law a body was not property and taking one was only a misdemeanor, while stealing a shroud was a felony. This episode explains how the UK's Murder Act of 1752 allowed dissection only of executed murderers while London medical schools may have needed up to 500 bodies a year. Resurrection men dug a small diagonal tunnel to the head of the coffin, snapped the lid, and shipped bodies folded in tea chests. In Scotland, William Burke and William Hare skipped the graveyard and murdered at least 16 people.

The burden fell on the poor: potter's fields, free Black communities, enslaved people, and Indigenous graves. Records from Transylvania University in Kentucky indicate up to 80 percent of corpses dissected there in the 1830s and 1840s were African American. Anger erupted in New York's 1788 Doctors' Riot, and in 1878 the body of John Scott Harrison was found hanging on a rope in a Cincinnati medical college. The episode extends to ghost marriages in China, Australia's Project Sunshine, and Michael Mastromarino's tissue scheme that took the bones of broadcaster Alistair Cooke.

• Burking, the suffocation method that left no marks for anatomists to notice
• Harvard's secret student society of grave robbers known as the Spunkers
• Guangdong officials stealing corpses in 2014 to meet cremation quotas
• Kolkata's bone trade, which went underground after India banned exports
• PVC pipes sewn into bodies in place of harvested bones before cremation

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Until the early 1980s, investigators had little hard data on how a human body decays outdoors, so time of death in a shallow grave was often guesswork. In 1981 William Bass, head of anthropology at the University of Tennessee in Knoxville and the state's forensic consultant, fenced off a wooded plot behind the medical center and began placing donated bodies in car trunks, water, plastic, and open sun. He tracked the stages from fresh to bloat, active decay, and skeleton, and how clothing and sunlight change the timeline. Neighbors protested, forming a group called SICK, but the data began solving cases.

Eight US facilities now cover different climates, from humid southeast Texas to arid Colorado Mesa University, where bodies tend to mummify, to the 26 acre site at Texas State University's Freeman Ranch. Fears about vultures near an airport there turned into research showing the birds can skeletonize a body in hours and leave marks resembling knife wounds. An Australian facility near Sydney used time lapse cameras to show bodies move as ligaments dry. The episode also covers Sue Black's case for pig proxies and Jennifer DeBruyn's work on the necrobiome as a microbial clock in the soil.

• Why a Knoxville decay model fails in the mountains of Colorado or the Texas heat
• How vultures scatter bones downhill and into trees
• What pigs cannot replicate: medications, chemotherapy, implants, and human weapon trauma
• Over 100 donated bodies a year at Tennessee, about 60 percent arranged by families
• Patricia Cornwell's novel The Body Farm and a character based on Bass

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The spinning red and white pole outside a barbershop began as a medical advertisement. After the Council of Tours in 1163 barred clergy from surgery, barbers took over bloodletting, tooth pulling, and amputations. Patients gripped a wooden staff to make their veins bulge, early poles carried brass basins for leeches and blood, and bloody bandages hung to dry twisted around the pole in the wind. Painted stripes later replaced the real cloths. In Renaissance Amsterdam the colors worked as a menu, and the blue on American poles was likely a patriotic addition.

The episode follows the symbol into modern turf wars and science. The William Marvy Company in Minnesota is the last North American maker, zoning rules ban rotating signs in many places, and a 2012 Michigan proposal pitted barbers against cosmetologists over who may display one. In South Korea, paired poles can signal a brothel. The barber pole illusion, rooted in the aperture problem, inspired computer progress bars, the striped maximum speed needle that pilots fly against, NASA talkback switches that Jim Lovell called barber poled during Apollo 13, and magnetoresistive sensors in phone compasses.

• Why the maximum safe airspeed needle slides lower as a jet climbs into colder air
• The barber's pole worm, the barber pole grasshopper, and the barber pole fish
• Sinosauropteryx, the feathered dinosaur whose banded tail was compared to a barber pole
• White Shoal Light in Michigan, Cold War border markers, and Canada's barber pole group of corvettes
• The Shepard tone, an audio illusion called a sonic barber pole

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For centuries the person who cut your hair also pulled teeth, applied leeches, and amputated limbs. This episode explains how that happened. Medieval university physicians considered touching blood beneath them, while monasteries needed resident barbers to maintain the monks' tonsures. When monks fell ill, humoral theory called for draining excess blood, and the barber with the razor took on bloodletting, scarification, lancing abscesses, and tooth extraction. By around 1000 AD these tradesmen appear in records as barber surgeons, and by 1254 the Italian physician Bruno da Longobucco was complaining about them.

Firearms and artillery in the 16th century made barber surgeons the trauma specialists of European battlefields, and French translations of surgical texts in the 1540s let them read anatomy for the first time. In Paris, surgeons of the long robe from the College of Saint Côme looked down on barbers of the short robe. Italy's universities trained physicians in surgery, Florence passed statutes in 1349 to subordinate barbers, and in London barbers and surgeons merged in 1540, split in 1745, and became the Royal College of Surgeons in 1800.

• Michel de Montaigne's argument that surgery was more reliable than internal medicine
• Sweden under Gustav Vasa assigning one barber surgeon to every company of 400 to 500 men
• The red and white barber pole as a marker of blood and bandages
• Why surgeons in the UK, Ireland, Australia, New Zealand, and South Africa use Mr. or Ms. instead of doctor
• Martín de Porres, Magdalena Bendzisławska, and Johanna Hedén among the trade's trailblazers

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During World War II, B.F. Skinner trained pigeons to peck at images of enemy ships so their pecks would steer a missile's fins. This episode follows Skinner from his 1904 birth in Pennsylvania, where he built an elderberry sorting machine as a boy, through his failed attempt to become a novelist after Hamilton College, a period he called his dark years. Reading John B. Watson led him to Harvard psychology, where he built the operant conditioning chamber and the cumulative recorder to measure voluntary behavior and its consequences without observer bias.

With Charles Ferster he mapped schedules of reinforcement, finding that the variable ratio schedule, the logic of a slot machine, produced the most persistent behavior. He also documented superstitious behavior in pigeons. Project Pigeon worked in lab tests but lost out to radar, and his climate controlled air crib became a public relations disaster after a magazine titled his article Baby in a Box. His 1948 novel Walden Two and Beyond Freedom and Dignity argued against free will, and Noam Chomsky's critique of Verbal Behavior helped launch the cognitive revolution. A 2002 survey named him the most influential psychologist of the 20th century.

• The seatbelt alarm as an everyday example of negative reinforcement
• Why Skinner found punishment only suppresses behavior temporarily
• Rumors about his daughter and the air crib that she spent years denying
• Temple Grandin's criticism of his dismissal of brain neurology
• A lifetime achievement award from the American Psychological Association 10 days before his death in 1990

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More than 2,000 years ago, texts from the Indian subcontinent described rebuilding a nose with a flap of skin from the cheek or forehead, along with removing kidney stones and cataracts. This episode explains the system behind them, Ayurveda, whose Sanskrit name means knowledge of life and longevity and which up to 80 percent of people in India and Nepal still use. It holds that the body and universe share five elements, earth, water, fire, air, and ether, which combine into three doshas: vata, pitta, and kapha. Health is the balance of a person's own baseline, called prakriti, and treatment works by applying opposites.

Diagnosis relies on the practitioner's senses, including tongue examination and nadi pariksha pulse reading, where a snake-like pulse signals vata, a frog-like one pitta, and a swan-like one kapha. About 90 percent of remedies are plant based, alongside daily routines and a sattvic diet. The episode then turns to the clash with modern medicine: the scientific establishment's pseudoscience label, the lack of evidence that Ayurveda can cure diseases like cancer, and Rasashastra, the alchemical practice from around the 11th century of adding metals that modern tests have found contain dangerous levels of lead, mercury, and arsenic.

• How each dosha is said to shape body type, temperament, and typical ailments
• Agni, the digestive fire, and ama, the toxic residue said to clog the body
• The Sushruta Samhita and more than a hundred surgical instruments shaped like bird beaks
• Why surgery came to be seen as a last resort within the system
• The split between institutional Ayurveda in India and the spa-focused global version since the 1970s

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The word autopsy comes from the Greek autopsia, to see for oneself. This episode follows that idea from ancient Egypt, where embalmers removed organs through small slits to protect the body for the afterlife, to 44 BCE, when the physician Antistius found that only the second of Julius Caesar's 23 stab wounds was fatal. Pope Boniface VIII's decree against boiling the bodies of crusaders, a practice called mos teutonicus, chilled anatomical study for generations until Pope Sixtus IV allowed dissection in university towns such as Bologna and Padua, opening the way for Andreas Vesalius in 1543 and Giovanni Battista Morgagni.

Today the clinical autopsy works as quality control for medicine. A large meta-analysis suggests about one third of death certificates are wrong, and a systematic review projects that 8.4 to 24.4 percent of autopsies in modern US hospitals will find major diagnostic errors, often visible only under the microscope. The episode walks through the procedure, from the head block and the nearly bloodless incision to removing organs en masse and fixing the brain in formaldehyde for weeks. It ends with falling autopsy rates in the UK, Germany, and the United States.

• Fetal alcohol syndrome, Legionnaires' disease, and viral hepatitis, all identified through autopsies
• An ICU study where intubated patients' abscesses and bowel perforations went unnoticed
• How red-staining dead neurons date a stroke to 1 to 3.5 days earlier
• The UK Human Tissue Act 2004 requiring organs to be returned before burial
• Consented adult inpatient autopsies in the UK down to 0.7 percent