Postal service and kite: what they have in common

1. Step 1. Postal service — uses — Steam locomotive. Mail trains.
2. Step 2. Steam locomotive — uses — Railway track. It runs on rails.
3. Step 3. Railway track — is used in — Truss bridge. Railway bridges.
4. Step 4. Truss bridge — has part — Truss. Trusses.
5. Step 5. Truss — is part of — Space frame. Space trusses.
6. Step 6. Space frame — evolved from — Kite. Bell came up with the structure while building tetrahedral kites.

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