Aqualung and kite: what they have in common

1. Step 1. Aqualung — evolved from — Diving suit. Autonomy.
2. Step 2. Diving suit — evolved into — Spacesuit. A sealed suit with an air supply.
3. Step 3. Spacesuit — is made of — Nylon. The outer layer is nylon and other synthetic fabrics.
4. Step 4. Nylon — works like — Silk. Nylon was created as a substitute for silk.
5. Step 5. Silk — is material for — Kite. Chinese kites were silk.

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