Coil spring and sickle: what they have in common

1. Step 1. Coil spring — uses — Elasticity. It works through elasticity.
2. Step 2. Elasticity — is used in — Bow and arrow. A bow stores the energy of elastic deformation and releases it into the arrow.
3. Step 3. Bow and arrow — is made of — Flint. Arrowheads were knapped from flint.
4. Step 4. Flint — is material for — Sickle. Neolithic sickles were a wooden base with flint inserts.

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