Darts and rolling mill: what they have in common

1. Step 1. Darts — is part of — Darts. Darts with flights.
2. Step 2. Darts — evolved from — Bow and arrow. Accuracy of shooting.
3. Step 3. Bow and arrow — uses — Elasticity. A bow stores the energy of elastic deformation and releases it into the arrow.
4. Step 4. Elasticity — is used in — Beam. Bending.
5. Step 5. Beam — includes — I-beam. A beam.
6. Step 6. I-beam — uses — Rolling mill. Rolling.

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