Codex Chronica An illustrated, source-grounded history of medicine. https://codexchronica.com/ 2026-07-10T00:00:00.000Z Eighteen Days https://codexchronica.com/eighteen-days/ 2026-06-26T00:00:00.000Z 2026-07-09T00:00:00.000Z Louis Washkansky survived the first human heart transplant for eighteen days, proving the operation and revealing the price of rejection therapy. Dr. D. Y. Kim The First Transplant https://codexchronica.com/the-first-transplant/ 2026-06-26T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1967 Christiaan Barnard moved a human heart from one body to another and forced medicine to ask where a person ends. Dr. D. Y. Kim Photograph 51 https://codexchronica.com/photograph-51/ 2026-06-30T00:00:00.000Z 2026-07-09T00:00:00.000Z Rosalind Franklin's Photograph 51 was part of the DNA story, but the deeper injustice lay in unpublished data and divided credit. Dr. D. Y. Kim Structure of Nucleic Acids https://codexchronica.com/structure-of-nucleic-acids/ 2026-07-01T00:00:00.000Z 2026-07-09T00:00:00.000Z Watson and Crick's double helix entered Nature as an elegant conjecture, not yet proof, and changed how medicine read inheritance. Dr. D. Y. Kim The Oxford Concentrate https://codexchronica.com/the-oxford-concentrate/ 2026-06-27T00:00:00.000Z 2026-07-09T00:00:00.000Z How Florey, Chain and their Oxford team turned Fleming's mould into penicillin, then scaled it in wartime bedpans and Midwestern vats. Dr. D. Y. Kim A Curious Contamination https://codexchronica.com/a-curious-contamination/ 2026-06-27T00:00:00.000Z 2026-07-09T00:00:00.000Z Alexander Fleming noticed a mould that killed bacteria in 1928; the miracle was not the accident, but how little came of it at first. Dr. D. Y. Kim The Boy in the Public Ward https://codexchronica.com/the-boy-in-the-public-ward/ 2026-06-26T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1922 Leonard Thompson received insulin in Toronto, turning childhood diabetes from a death sentence into a disease medicine could hold back. Dr. D. Y. Kim The Discovery of Insulin https://codexchronica.com/the-discovery-of-insulin/ 2026-06-27T00:00:00.000Z 2026-07-09T00:00:00.000Z Toronto's insulin story was not one discovery but a quarrelsome relay from Banting's hunch to a hormone the world could bottle. Dr. D. Y. Kim The Shadow of the Ring https://codexchronica.com/the-shadow-of-the-ring/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z The X-ray's first marvel was a hand with a ring; its shadow also marked the beginning of radiation injury. Dr. D. Y. Kim A New Kind of Ray https://codexchronica.com/a-new-kind-of-ray/ 2026-06-28T00:00:00.000Z 2026-07-09T00:00:00.000Z Wilhelm Röntgen's X-rays let medicine see inside the living body, even as the new ray began to burn the hands that held it. Dr. D. Y. Kim Koch's Postulates https://codexchronica.com/kochs-postulates/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z Koch's postulates were not quite four, not quite fixed, and not quite obeyed, but they changed how medicine proved a germ guilty. Dr. D. Y. Kim The Tubercle Bacillus https://codexchronica.com/the-tubercle-bacillus/ 2026-07-02T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1882 Robert Koch made the tubercle bacillus visible and gave medicine a method for proving a microbe caused disease. Dr. D. Y. Kim The Carbolic Spray https://codexchronica.com/the-carbolic-spray/ 2026-06-28T00:00:00.000Z 2026-07-09T00:00:00.000Z Lister's carbolic spray became the icon of antisepsis, then the thing he later called a mistake once germs were understood. Dr. D. Y. Kim On the Antiseptic Principle https://codexchronica.com/on-the-antiseptic-principle/ 2026-06-28T00:00:00.000Z 2026-07-09T00:00:00.000Z Joseph Lister faced the hidden killer that anaesthesia had made more dangerous: the infected surgical wound. Dr. D. Y. Kim Of Ferments and Disease https://codexchronica.com/of-ferments-and-disease/ 2026-07-02T00:00:00.000Z 2026-07-09T00:00:00.000Z Pasteur saw fermentation as the work of living microbes and began to connect spoiled wine, silkworm disease and rotting wounds. Dr. D. Y. Kim The Swan-Neck Flask https://codexchronica.com/the-swan-neck-flask/ 2026-06-27T00:00:00.000Z 2026-07-09T00:00:00.000Z Louis Pasteur's swan-neck flask ended spontaneous generation by showing that broth stayed clear when dust could not fall into it. Dr. D. Y. Kim The Rose Diagram https://codexchronica.com/the-rose-diagram/ 2026-06-28T00:00:00.000Z 2026-07-09T00:00:00.000Z Florence Nightingale's rose diagram turned mortality data into a picture power could not ignore, even if the famous name is wrong. Dr. D. Y. Kim The Lady with the Lamp https://codexchronica.com/the-lady-with-the-lamp/ 2026-06-28T00:00:00.000Z 2026-07-09T00:00:00.000Z Florence Nightingale's legend began with the lamp, but her greatness lay in proving that Scutari's hospitals were killing soldiers. Dr. D. Y. Kim The Broad Street Pump https://codexchronica.com/the-broad-street-pump/ 2026-06-28T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1854 John Snow traced cholera deaths to a single Soho pump, turning a map, a list and a handle into public-health evidence. Dr. D. Y. Kim The End of Heroic Speed https://codexchronica.com/the-end-of-heroic-speed/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z Ether ended the age when surgical greatness meant speed, and opened a slower operating room still haunted by infection. Dr. D. Y. Kim Chloroform & the Queen https://codexchronica.com/chloroform-the-queen/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z John Snow gave chloroform to Queen Victoria in 1853, lending royal authority to a drug that could stop a heart in minutes. Dr. D. Y. Kim A Day at the Ether Dome https://codexchronica.com/a-day-at-the-ether-dome/ 2026-06-25T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1846 William Morton used ether at Massachusetts General Hospital and changed surgery by silencing its oldest companion: the scream. Dr. D. Y. Kim The Sounds of the Lung https://codexchronica.com/the-sounds-of-the-lung/ 2026-06-29T00:00:00.000Z 2026-07-09T00:00:00.000Z Laennec used the stethoscope to match chest sounds in the living to lesions in the dead, teaching disease to speak in noise. Dr. D. Y. Kim A Cylinder of Paper https://codexchronica.com/a-cylinder-of-paper/ 2026-06-28T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1816 René Laennec rolled paper into a tube, heard the living chest more clearly, and began the age of the stethoscope. Dr. D. Y. Kim The Boy James Phipps https://codexchronica.com/the-boy-james-phipps/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z James Phipps, Jenner's eight-year-old subject, exposes the uneasy human experiment at the birth of vaccination. Dr. D. Y. Kim An Inquiry into the Cow-Pox https://codexchronica.com/an-inquiry-into-the-cow-pox/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z Edward Jenner did not invent vaccination, but his cow-pox experiment on James Phipps began the end of smallpox. Dr. D. Y. Kim Of Valves and Vessels https://codexchronica.com/of-valves-and-vessels/ 2026-07-01T00:00:00.000Z 2026-07-09T00:00:00.000Z Venous valves were seen for decades before Harvey asked the decisive question: not what they were, but which way they opened. Dr. D. Y. Kim De Motu Cordis https://codexchronica.com/de-motu-cordis/ 2026-06-30T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1628 William Harvey proved by arithmetic that blood moves in a closed circle, though he never saw the capillaries that close it. Dr. D. Y. Kim The Theatre of Anatomy https://codexchronica.com/the-theatre-of-anatomy/ 2026-07-02T00:00:00.000Z 2026-07-09T00:00:00.000Z Padua's anatomical theatre made dissection a public act, staging the corpse as the evidence medicine was learning to trust. Dr. D. Y. Kim De Humani Corporis Fabrica https://codexchronica.com/de-humani-corporis-fabrica/ 2026-06-29T00:00:00.000Z 2026-07-09T00:00:00.000Z In 1543 Vesalius told medicine to see the body for itself, even as his masterpiece struggled to escape Galen's authority. Dr. D. Y. Kim Contagion & Quarantine https://codexchronica.com/contagion-and-quarantine/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z Centuries before germ theory, quarantine and physicians like Ibn al-Khaṭīb treated disease as something that could travel. Dr. D. Y. Kim The Canon of Medicine https://codexchronica.com/the-canon-of-medicine/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z Avicenna's Canon ordered Greek and Arabic medicine into five books, preserving its power and making its errors durable. Dr. D. Y. Kim Physician to the Gladiators https://codexchronica.com/physician-to-the-gladiators/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z Before Galen ruled medicine through books, he learned living anatomy in the wounds of Pergamon's gladiators. Dr. D. Y. Kim On the Usefulness of the Parts https://codexchronica.com/on-the-usefulness-of-the-parts/ 2026-07-03T00:00:00.000Z 2026-07-09T00:00:00.000Z Galen's On the Usefulness of the Parts made anatomy a hymn to purpose, brilliant in experiment and wrong where animals stood for men. Dr. D. Y. Kim The Four Humours https://codexchronica.com/the-four-humours/ 2026-06-29T00:00:00.000Z 2026-07-09T00:00:00.000Z The four humours were wrong about the body, yet their balance of blood, phlegm and bile ruled Western medicine for two millennia. Dr. D. Y. Kim On the Sacred Disease https://codexchronica.com/on-the-sacred-disease/ 2026-06-29T00:00:00.000Z 2026-07-10T00:00:00.000Z A Hippocratic treatise denied that epilepsy was sacred and placed the falling sickness in the brain, founding a medicine of causes. Dr. D. Y. Kim