Router and vacuum pump: what they have in common

1. Step 1. Router — has part — Radio module and antenna. A Wi-Fi access point.
2. Step 2. Radio module and antenna — is part of — Space probe. Communication with Earth.
3. Step 3. Space probe — is made of — Titanium. The tanks are titanium.
4. Step 4. Titanium — is material for — Artificial heart valve. Titanium and pyrolytic carbon.
5. Step 5. Artificial heart valve — has part — Check valve. It works as a check valve.
6. Step 6. Check valve — is part of — Vacuum pump. Valves stop air from flowing back.

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