Planetary gear e petri dish: o que têm em comum

1. Passo 1. Planetary gear — faz parte de — Watt steam engine. Watt’s “sun and planet” gear got around the patent on the crank.
2. Passo 2. Watt steam engine — utiliza — Carvão mineral. Steam engines were fired with coal.
3. Passo 3. Carvão mineral — é material para — Synthetic dye. Aniline from coal tar.
4. Passo 4. Synthetic dye — evoluiu para — Sulfonamides. Prontosil was a red dye.
5. Passo 5. Sulfonamides — funciona como — Antibiótico. The first mass-market antibacterial drugs were synthetic sulfonamides; penicillin was discovered earlier (1928) but went into production later.
6. Passo 6. Antibiótico — utiliza — Petri dish. Fleming noticed mould in a Petri dish.

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