History of science
The history of science traces how scientific ideas were born, contested and ultimately prevailed. Orb: On the Movements of the Earth unfolds at a turning point: the shift from geocentrism to heliocentrism, and the price paid by those who dared to observe the sky differently.
Entries in this discipline
Aristotelian physics
Rafal cites Aristotle to prove the Earth is at the center in Orb. We explain Aristotelian physics and its link to geocentrism.
The astrolabe
In Orb: On the Movements of the Earth, Rafal owns an astrolabe. We explain what this ancient astronomical instrument is, what it does and how it works.
Ptolemy's geocentric model
Before heliocentrism, the Earth sat at the center of the world. We explain Ptolemy's geocentric model, its epicycles, and why it lasted over a thousand years.
Heliocentrism
Hubert defends a forbidden idea in Orb: the Sun at the center, the Earth turning. We explain heliocentrism, its history, and why it caused such an uproar.
Star magnitude
Rafal marvels at seeing a magnitude-six star in Orb. We explain what magnitude is, why the scale runs backwards, and the limit of the naked eye.
Why measure a star with an astrolabe
The stars are already engraved on the astrolabe, so why sight one? The instrument is a calculator that derives the time, your orientation and your latitude.
Autopsy and Forensic Medicine
In The Apothecary Diaries, a body is examined. We explain autopsy, post-mortem signs, and the birth of forensic medicine.
Beekeeping
In The Apothecary Diaries, Lady Fonmin's luxurious honeys come from a beekeeping family. Colony structure, castes, varietal honeys, and the history of beekeeping.
The Bezoar
Not a universal one: this digestive stone only binds some arsenic compounds. Where the legend came from, and the ox bezoar in The Apothecary Diaries.
Black Powder
In The Apothecary Diaries, Maomao states the exact formula for black powder. We explain the role of each ingredient, the reaction, and the rotten-egg smell.
The Caesarean Section
Before antisepsis and anesthesia, caesarean section almost always killed the mother. We explain why, and what changed everything in the 19th century.
Castration and Eunuchs
Castration before puberty keeps the voice high, the limbs long and the face beardless. The real biology behind court eunuchs, and why age changes everything.
Elixirs of Immortality
Cinnabar, mercury, arsenic: Chinese waidan alchemy sought eternal life in poisons. The alchemists' logic, what mercury does to the brain, and who died of it.
Emmenagogue and Abortive Plants
Mostly they poisoned first: jasmine, mugwort, rue and chili stimulate the uterus only at doses toxic to the mother. The pharmacology and history behind them.
Fake Death by Tetrodotoxin
Partly: pufferfish poison can paralyze a person until they look dead, brain still awake. Datura agitates instead of sedating. Mechanisms, real cases, limits.
Revealing Fingerprints
Revealing fingerprints with flour. We explain the chemistry of latent prints and the history of dactyloscopy, born in ancient China.
Foot Binding
In The Apothecary Diaries, a victim's bound feet prove she couldn't have climbed alone. We explain the real bone deformation and its effects.
Four O'Clock Flower
Partly: four o'clock flower seeds hold a protein that ends pregnancy in mice, never tested in women. Mechanism, toxicity and the limits of court lore.
The Glass Mirror
Why does a glass mirror give a far sharper image than polished bronze? The history of Venetian silvering and the chemistry of mirror-making.
Lead White Makeup
Ceruse is lead carbonate: worn daily, it caused slow lead poisoning. The symptoms, why it killed nursing infants, and the palace curse in The Apothecary Diaries.
The Magic Mirror
In The Apothecary Diaries, a bronze mirror projects its engravings in reflected light. We explain the real physics behind this so-called magic mirror.
Mercury
In The Apothecary Diaries, quicksilver goes into a court poison. We explain mercury, its toxicity, and the immortality elixirs that killed emperors.
Miasma Theory
In The Apothecary Diaries, incense is burned to ward off illness. We explain miasma theory, its kernel of truth, and how Pasteur overturned it.
Papermaking
In The Apothecary Diaries, Maomao diagnoses crumbly paper. We explain papermaking, cellulose, and Cai Lun's invention.
Orpiment and Arsenic
In The Apothecary Diaries, a yellow pigment poisons slowly. We explain orpiment, arsenic, and the chronic poisoning of court painters.
Physic Garden
The physic garden is the cradle of plant-based pharmacopoeia. Monasteries, universities, imperial China: the history of a centuries-old place of knowledge.
Public Baths and Hygiene
Partly: communal hot baths clean and relax, but spread fungi and bacteria and can make blood pressure crash. What history and physiology show.
Quarantine and Isolation
In The Apothecary Diaries, a contagious patient is isolated. The history of quarantine, fomites, and isolation long before germs were understood.
Sensory Detection of Poison
Rarely: arsenic and tetrodotoxin have no smell or color. What imperial food tasters could catch, why silver failed, and what The Apothecary Diaries gets right.
Silver and Poison Detection
Not to poison itself: silver tarnishes from sulfur, not arsenic. Why the old silver spoon test seemed to work, what it misses, and what The Apothecary Diaries gets right.
Surgical Sutures
In The Apothecary Diaries, Maomao is recovering from fifteen stitches. The history of suture thread, from Egyptian linen to resorbable catgut and synthetic thread.
Black Powder
Roughly 75% saltpeter, 15% charcoal, 10% sulfur. What each ingredient does, why it deflagrates instead of detonating, and the sulfur mistake in Dr Stone.
Dynamite
Alfred Nobel, in 1867: soaked into diatomaceous earth, nitroglycerin became safe to carry. Why that works, what it changed, and the dynamite in Dr Stone.
Morse code
Senku communicates in Morse code in Dr Stone. We explain how this code encodes letters as short and long signals, transmissible by sound, light, or current.
Papermaking
Senku makes paper in Dr Stone. We explain how alkaline cooking frees cellulose fibers by dissolving lignin, then how the sheet is formed.