Roman concrete and dewar flask: what they have in common

1. Step 1. Roman concrete — is material for — Dome. The dome of the Pantheon is cast in Roman concrete.
2. Step 2. Dome — includes — Glass dome. A dome.
3. Step 3. Glass dome — has part — Mirror. A mirrored cone directs light into the hall.
4. Step 4. Mirror — is part of — Vacuum flask. The silvering reflects heat radiation.
5. Step 5. Vacuum flask — evolved from — Dewar flask. A household Dewar flask.

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