Browse the library
13 ideas
A pinch of iodine in salt prevents a leading cause of preventable brain damage.
Iodine deficiency causes goitre and can harm children's brain development. Switzerland began iodising salt in 1922 and the USA in 1924; the WHO now recommends iodised salt worldwide.
Why it matters: Choosing iodised salt is one of the cheapest health decisions a family can make.
Iodised salt — World Health Organization (1922)
✓ Real published source · Check the source
The word "vitamin" began as a scientific guess.
In 1912 Casimir Funk proposed that diseases such as beriberi and scurvy came from missing "vital amines" in food, and coined the word vitamine. The e was dropped when not all proved to be amines.
Why it matters: It changed nutrition from eating enough food to eating the right food.
The etiology of the deficiency diseases — Casimir Funk (1912)
Journal of State Medicine, 1912
✓ Real published source · Check the source
Chickens fed white rice gave the first clue to vitamins.
In the 1890s in Java, Christiaan Eijkman found that chickens fed polished white rice developed a beriberi-like illness, while those given unpolished rice recovered. Something in the outer layer was vital.
Why it matters: This led to the discovery of vitamin B1; Eijkman shared the 1929 Nobel Prize.
Nobel Prize in Physiology or Medicine 1929 — Christiaan Eijkman (1897)
✓ Real published source · Check the source
One of the first controlled trials in medicine took place on a ship.
In 1747 naval surgeon James Lind gave sailors with scurvy different treatments. The two given oranges and lemons recovered fastest. He published his results in 1753.
Why it matters: Comparing treatments fairly is still how we find out what works.
A Treatise of the Scurvy — James Lind (1753)
Trial aboard HMS Salisbury, 1747
✓ Real published source · Check the source
The bacterium that makes yogurt was identified by a young Bulgarian student.
In 1905 Stamen Grigorov, working in Geneva, identified the bacterium now called Lactobacillus bulgaricus in Bulgarian yogurt. It turns milk sugar into lactic acid, which thickens and preserves it.
Why it matters: Dahi, lassi and cheese all depend on helpful microbes like this one.
Étude sur un lait fermenté comestible — Stamen Grigorov (1905)
Revue médicale de la Suisse romande, 1905
✓ Real published source · Check the source
Canned food was invented before anyone knew why it worked.
Nicolas Appert sealed food in glass jars and heated them, winning a French government prize. He published his method in 1810 — decades before Pasteur explained that heat kills microbes.
Why it matters: Careful practice can run ahead of theory — and both matter.
L'Art de conserver, pendant plusieurs années, toutes les substances animales et végétales — Nicolas Appert (1810)
✓ Real published source · Check the source
Gentle heat can make milk safe without boiling it.
In the 1860s Louis Pasteur showed that heating wine to around 50–60°C killed the microbes that spoiled it. The same idea, applied to milk, became pasteurisation.
Why it matters: It stops diseases such as tuberculosis and brucellosis spreading through milk.
Études sur le vin — Louis Pasteur (1866)
✓ Real published source · Check the source
The golden crust on naan and the smell of roasting meat share the same chemistry.
In 1912 French chemist Louis-Camille Maillard described how amino acids and sugars react when heated, creating brown colour and hundreds of new flavour and aroma compounds.
Why it matters: Understanding it lets cooks control flavour and food scientists reduce harmful by-products.
Action des acides aminés sur les sucres — Louis-Camille Maillard (1912)
Comptes rendus de l'Académie des sciences, 1912
✓ Real published source · Check the source
A simple mix of salt, sugar and clean water has saved millions of children.
Oral rehydration solution was developed and tested in the 1960s, including at the cholera research laboratory in Dhaka. Glucose helps the gut absorb salt and water, reversing dehydration.
Why it matters: It is cheap, can be given at home, and remains a frontline treatment for diarrhoea worldwide.
Oral rehydration therapy — Cholera Research Laboratory, Dhaka (now icddr,b) (1960s)
✓ Real published source · Check the source
One medical textbook was studied for centuries across two continents.
Ibn Sina completed al-Qanun fi al-Tibb in 1025, organising knowledge of diseases, drugs and diagnosis. Translated into Latin, it was taught in European universities for centuries.
Why it matters: Its rules for testing medicines carefully foreshadowed modern clinical trials.
The Canon of Medicine (al-Qanun fi al-Tibb) — Ibn Sina (Avicenna) (1025)
✓ Real published source · Check the source
Washing hands once cut deaths on a hospital ward dramatically.
In 1847 Ignaz Semmelweis made doctors in Vienna wash their hands in chlorinated lime before delivering babies. Deaths from childbed fever on his ward fell sharply.
Why it matters: Handwashing is still one of the simplest ways to stop infection spreading.
The Etiology, Concept and Prophylaxis of Childbed Fever — Ignaz Semmelweis (1861)
Handwashing introduced at Vienna General Hospital, 1847
✓ Real published source · Check the source
A plate left out on a lab bench led to the first antibiotic.
In 1928 Alexander Fleming noticed a mould had killed the bacteria around it on a culture plate. Howard Florey and Ernst Chain later turned penicillin into a usable medicine.
Why it matters: Antibiotics have saved millions of lives — which is why they must not be misused.
On the antibacterial action of cultures of a penicillium — Alexander Fleming (1929)
British Journal of Experimental Pathology, 1929; Nobel Prize 1945
✓ Real published source · Check the source
A disease caught by milkmaids led to the first vaccine.
Edward Jenner noticed milkmaids who caught cowpox seemed protected from smallpox. In 1796 he inoculated a boy with cowpox and showed he was then protected. He published in 1798.
Why it matters: Vaccination eventually wiped out smallpox; the WHO declared it eradicated in 1980.
An Inquiry into the Causes and Effects of the Variolae Vaccinae — Edward Jenner (1798)
✓ Real published source · Check the source