Van de Graaff generator and piston pump: what they have in common

1. Step 1. Van de Graaff generator — is made of — Vulcanized rubber. The belt is rubber.
2. Step 2. Vulcanized rubber — is material for — Spacesuit. The pressure bladder is rubber.
3. Step 3. Spacesuit — evolved from — Diving suit. A sealed suit with an air supply.
4. Step 4. Diving suit — has part — Piston pump. Air was pumped from the surface.

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