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
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)
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.
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