Wheellock and petri dish: what they have in common

1. Step 1. Wheellock — evolved into — Flintlock. Simpler and cheaper.
2. Step 2. Flintlock — evolved into — Percussion cap. The percussion lock replaced the flintlock.
3. Step 3. Percussion cap — uses — Chemical reaction. Mercury fulminate explodes when struck.
4. Step 4. Chemical reaction — includes — Fermentation. A biochemical reaction.
5. Step 5. Fermentation — is used in — Antibiotic. Penicillin is produced by fermentation.
6. Step 6. Antibiotic — uses — Petri dish. Fleming noticed mould in a Petri dish.

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