Biology
Biology studies living things, from the cell to the ecosystem: genetics, physiology, botany, ecology. In Dr Stone, it underpins survival (edible and toxic plants), plant reproduction and the understanding of the organisms Senku exploits to rebuild civilization.
Entries in this discipline
Bear Bile
Its ursodeoxycholic acid (UDCA) dissolves some gallstones and protects the liver. Now made synthetically, it is on the WHO essential medicines list.
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.
Beeswax
Beeswax, a hydrophobic mix of esters that melts around 62°C. Candles, ointments, waterproofing, lost-wax casting: its ancient uses explained.
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.
Color Blindness
In The Apothecary Diaries, red-green color blindness unlocks a dynastic mystery. We explain cone cells, the X chromosome, and prevalence.
Cordyceps
No: each species targets one specific insect host. How it hijacks ants, the caterpillar fungus of Chinese medicine, and the idea in The Apothecary Diaries.
Decomposition and Mummification
In The Apothecary Diaries, a body remains intact for a year. We explain autolysis, bacterial putrefaction, and what stops it: cold, dryness, preserving salts.
Diabetes
In The Apothecary Diaries, an all-sugar diet hints at diabetes. We explain blood glucose, insulin, and the historic sign of sweet urine.
Diapause and Hibernation
In The Apothecary Diaries, snakes numbed by the cold let Maomao act safely. We explain torpor, hibernation, and diapause.
A Dog's Sense of Smell
Maomao deduces that the dog tracked gunpowder. We explain why dogs smell a hundred times better, how they follow a trail, and how it's used today.
Earthworms in Medicine
Used against fever in Chinese medicine, earthworms contain lumbrokinases that break down clots in the lab. What is proven, what is not, and Maomao's remedy.
Entomophagy
In The Apothecary Diaries, Maomao munches on crickets at the festival. We explain entomophagy, its nutritional value, and its ecological appeal.
False Pregnancy
A swollen belly, missing periods, milk without pregnancy: The Apothecary Diaries describes pseudocyesis. The hormonal and psychological mechanism.
Food Allergy
In The Apothecary Diaries, a fish soup nearly kills. We explain IgE, histamine, anaphylaxis, and the risks of desensitization.
Fugu and Tetrodotoxin
In The Apothecary Diaries, Maomao loves fugu and its poison. We explain tetrodotoxin, how it paralyzes, and why there's no antidote.
Frog Skin
Frog skin is both a respiratory organ and a chemical arsenal. Protective mucus, bufotoxins, batrachotoxin, and chan su in traditional medicine.
Fungal Bioluminescence
In The Apothecary Diaries, a glowing mushroom is mistaken for a chanterelle. We explain fungal bioluminescence and this dangerous mix-up.
Inbreeding
In The Apothecary Diaries, Maomao brings up dynastic inbreeding. We explain why unions between close relatives raise genetic risk.
Insect Pheromones
In The Apothecary Diaries, crushed insects draw swarms of males. We explain pheromones, the silkworm moth's bombykol, and their modern uses.
Hypothermia
In The Apothecary Diaries, cold threatens lives. We explain hypothermia, why cold-water immersion is so dangerous, and how to rewarm safely.
Lizard Tail Autotomy
A lizard can shed its tail to escape a predator. We explain the fracture planes, cartilage regrowth, and the evolutionary cost of this sacrifice.
Loss of Taste
In The Apothecary Diaries, Konen could no longer taste salt. We explain ageusia, the decisive role of smell, and the real causes of taste loss.
The Mantis Ootheca
In The Apothecary Diaries, mantis eggs are seen as an aphrodisiac. We describe the ootheca, its structure, and its use in Chinese medicine.
The Menstrual Cycle and Fertility
Maomao references the empirical knowledge of the fertile window. We explain the phases of the cycle, ovulation, hormones, and what ancient medicine actually knew.
Matsutake
In The Apothecary Diaries, Maomao trades premium matsutake. We explain the obligate mycorrhizal symbiosis that makes it impossible to cultivate.
Musk
In The Apothecary Diaries, Maomao recognizes the scent of musk. We explain muscone, the musk deer's gland, and synthetic musks.
Nerve Damage and Paralysis
In The Apothecary Diaries, a beating leaves a man paralyzed. We explain how nerve damage cuts off muscle control and why recovery is uncertain.
Night Vision
In The Apothecary Diaries, seeing in the dark is a real biological trait. We explain rods, rhodopsin, and dark adaptation.
Photoperiod and Flowering
How plants measure night length via phytochrome to decide when to flower. Short-day plants, long-day plants, and horticultural forcing explained.
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.
Royal Jelly
In The Apothecary Diaries, Maomao recognizes royal jelly. We explain how this secretion turns a larva into a queen, and its limits in humans.
Saxitoxin and Toxic Shellfish
Microalgae make saxitoxin and mussels store it: it blocks nerve signals, with no antidote. Red tides, the fugu comparison, and the case in The Apothecary Diaries.
Silver Vine
In The Apothecary Diaries, silver vine sends cats into a trance. We explain matatabi, its iridoids, and their dual role as sedative and mosquito repellent.
Spider Silk and Hemostasis
Partly: silk fibers trap platelets and help a clot form, but a web holds no vitamin K. Folk remedy vs myth, and spider silk in modern surgery.
Caffeine
Senku brews a caffeine stimulant from tea leaves. We explain how caffeine acts on the brain, its real effects, and how much of the power-up drink is myth.
Fly Agaric
The fly agaric in Dr Stone: we explain why the red mushroom with white spots is hallucinogenic, the role of muscimol, and how toxic it really is.
Medicinal Plants
Swertia, licorice, Coptis: these medicinal plants contain real, documented active compounds. We break down their uses in Dr Stone.