Aluminium can and pneumatic tube: what they have in common

1. Step 1. Aluminium can — evolved from — Tin can. A tin can.
2. Step 2. Tin can — is made of — Tin. Tinplate.
3. Step 3. Tin — is material for — Model railway. The first models were tinplate.
4. Step 4. Model railway — works like — Steam locomotive. A model.
5. Step 5. Steam locomotive — is used in — Postal service. Mail trains.
6. Step 6. Postal service — includes — Pneumatic tube. The post.

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