PCR and sickle: what they have in common

1. Step 1. PCR — uses — Chemical reaction. An enzymatic reaction.
2. Step 2. Chemical reaction — is used in — Percussion cap. Mercury fulminate explodes when struck.
3. Step 3. Percussion cap — evolved from — Flintlock. The percussion lock replaced the flintlock.
4. Step 4. Flintlock — is made of — Flint. A flint strikes the spark.
5. Step 5. Flint — is material for — Sickle. Neolithic sickles were a wooden base with flint inserts.

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