Tuned mass damper and knife: what they have in common

1. Step 1. Tuned mass damper — is made of — Concrete. Or concrete.
2. Step 2. Concrete — evolved from — Roman concrete. A revival of Roman technology.
3. Step 3. Roman concrete — evolved from — Mortar. Roman concrete developed from lime mortars.
4. Step 4. Mortar — is used in — Trowel. It applies mortar.
5. Step 5. Trowel — has part — Handle. A handle on a curved neck.
6. Step 6. Handle — is part of — Knife. A handle.

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