Polyethylene and kite: what they have in common

1. Step 1. Polyethylene — is made of — Crude oil. Made from petroleum products.
2. Step 2. Crude oil — is material for — Nylon. The raw material is petrochemical.
3. Step 3. Nylon — works like — Silk. Nylon was created as a substitute for silk.
4. Step 4. Silk — is material for — Kite. Chinese kites were silk.

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