Chin strap and air conditioner: what they have in common

1. Step 1. Chin strap — is part of — Helmet. A mount.
2. Step 2. Helmet — has part — Dome. A protective shell.
3. Step 3. Dome — is made of — Roman concrete. The dome of the Pantheon is cast in Roman concrete.
4. Step 4. Roman concrete — evolved into — Concrete. A revival of Roman technology.
5. Step 5. Concrete — is material for — Data centre. The building is concrete.
6. Step 6. Data centre — has part — Air conditioner. Cooling.

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