Grenade body and elevator: what they have in common

1. Step 1. Grenade body — is part of — Grenade. A casing that produces fragments.
2. Step 2. Grenade — is made of — Clay. Medieval grenades were ceramic vessels.
3. Step 3. Clay — is material for — Dam. The core of the dam is clay and earth.
4. Step 4. Dam — is made of — Reinforced concrete. Concrete dams.
5. Step 5. Reinforced concrete — is material for — Skyscraper. Reinforced concrete.
6. Step 6. Skyscraper — has part — Elevator. A skyscraper is impossible without a lift.

Open Evothings