Hat and pneumatic tube: what they have in common

1. Step 1. Hat — has part — Hat band ribbon. A band at the base of the crown.
2. Step 2. Hat band ribbon — is part of — Van de Graaff generator. It carries charge upwards.
3. Step 3. Van de Graaff generator — evolved into — Particle accelerator. Early accelerators.
4. Step 4. Particle accelerator — uses — Vacuum. A vacuum chamber.
5. Step 5. Vacuum — is used in — Hyperloop (concept). A vacuum in the tube.
6. Step 6. Hyperloop (concept) — was inspired by — Pneumatic tube. Capsules in a tube — pneumatic post for people.

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