Broom twigs and boyle’s air pump: what they have in common

1. Step 1. Broom twigs — is part of — Broom. A bundle of twigs or sorghum.
2. Step 2. Broom — is made of — Plant fibre. A broom is tied from twigs and grasses.
3. Step 3. Plant fibre — is material for — Footwear. The oldest sandals (Fort Rock) were woven from sagebrush bark.
4. Step 4. Footwear — is made of — Leather. Leather.
5. Step 5. Leather — is material for — Piston. They were sealed with a leather cup.
6. Step 6. Piston — is part of — Boyle’s air pump. A plunger.

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