Periodic table and sickle: what they have in common

1. Step 1. Periodic table — uses — Atomic theory. A classification of atoms.
2. Step 2. Atomic theory — is used in — Chemical reaction. A rearrangement of atoms.
3. Step 3. Chemical reaction — is used in — Percussion cap. Mercury fulminate explodes when struck.
4. Step 4. Percussion cap — evolved from — Flintlock. The percussion lock replaced the flintlock.
5. Step 5. Flintlock — is made of — Flint. A flint strikes the spark.
6. Step 6. Flint — is material for — Sickle. Neolithic sickles were a wooden base with flint inserts.

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