Torsion bar suspension and stone tool: what they have in common

1. Step 1. Torsion bar suspension — uses — Elasticity. It works in torsion.
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 — Stone tool. Tools were knapped from flint and other rocks with a sharp fracture.

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