Broom and truck: what they have in common

1. Step 1. Broom — is made of — Plant fibre. A broom is tied from twigs and grasses.
2. Step 2. Plant fibre — is material for — Darts. Modern ones are made of compressed sisal.
3. Step 3. Darts — evolved from — Bow and arrow. Accuracy of shooting.
4. Step 4. Bow and arrow — uses — Elasticity. A bow stores the energy of elastic deformation and releases it into the arrow.
5. Step 5. Elasticity — is used in — Leaf spring. The leaves bend and spring back.
6. Step 6. Leaf spring — is part of — Truck. Leaf-spring suspension.

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