Gelatin capsule shell and router: what they have in common

1. Step 1. Gelatin capsule shell — is part of — Capsule. It dissolves in the stomach.
2. Step 2. Capsule — is part of — Pneumatic tube. A container for letters.
3. Step 3. Pneumatic tube — is a kind of — Postal service. The post.
4. Step 4. Postal service — evolved into — Email. Electronic mail.
5. Step 5. Email — uses — ARPANET. It appeared on ARPANET.
6. Step 6. ARPANET — has part — Router. The IMPs were the first routers.

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