Virtual memory and pneumatic tube: what they have in common

1. Step 1. Virtual memory — uses — Hard disk drive. Paging to disk.
2. Step 2. Hard disk drive — uses — Magnetism. Magnetic recording.
3. Step 3. Magnetism — evolved into — Electromagnetism. Ørsted linked magnetism with current.
4. Step 4. Electromagnetism — is used in — Maglev. Electromagnets hold and move the train.
5. Step 5. Maglev — evolved into — Hyperloop (concept). It develops the idea of magnetic levitation.
6. Step 6. Hyperloop (concept) — was inspired by — Pneumatic tube. Capsules in a tube — pneumatic post for people.

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