Planetary gear et petri dish : ce qu'ils ont en commun

1. Étape 1. Planetary gear — fait partie de — Watt steam engine. Watt’s “sun and planet” gear got around the patent on the crank.
2. Étape 2. Watt steam engine — utilise — Charbon. Steam engines were fired with coal.
3. Étape 3. Charbon — est un matériau pour — Synthetic dye. Aniline from coal tar.
4. Étape 4. Synthetic dye — a évolué en — Sulfonamides. Prontosil was a red dye.
5. Étape 5. Sulfonamides — fonctionne comme — Antibiotique. The first mass-market antibacterial drugs were synthetic sulfonamides; penicillin was discovered earlier (1928) but went into production later.
6. Étape 6. Antibiotique — utilise — Petri dish. Fleming noticed mould in a Petri dish.

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