Calculus and syringe: what they have in common

1. Step 1. Calculus — is used in — Newton’s laws. Mechanics built on calculus.
2. Step 2. Newton’s laws — is used in — Billiards. Collisions of balls.
3. Step 3. Billiards — is made of — Wool. The baize.
4. Step 4. Wool — is material for — Trousers. The oldest trousers (Yanghai) were sewn from wool.
5. Step 5. Trousers — uses — Needle. Trousers were sewn with a needle.
6. Step 6. Needle — is part of — Syringe. A hollow needle.

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