Hat brim and internal combustion engine: what they have in common

1. Step 1. Hat brim — is part of — Hat. The brim of the hat.
2. Step 2. Hat — is made of — Felt. Felt.
3. Step 3. Felt — is a kind of — Textile. Felt is cloth without threads: wool is matted until the fibres lock.
4. Step 4. Textile — is made of — Cotton. Cotton.
5. Step 5. Cotton — is material for — Biplane. The covering is fabric.
6. Step 6. Biplane — has part — Internal combustion engine. A piston engine turns the propeller.

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