Trebuchet sling and nuclear reactor: what they have in common

1. Step 1. Trebuchet sling — is part of — Trebuchet. It lengthens the throw.
2. Step 2. Trebuchet — is made of — Stone. It hurled stone balls.
3. Step 3. Stone — is material for — Foundation. Ancient foundations were laid of stone.
4. Step 4. Foundation — is made of — Concrete. Concrete.
5. Step 5. Concrete — is material for — Nuclear power plant. The containment is concrete.
6. Step 6. Nuclear power plant — has part — Nuclear reactor. The reactor heats the coolant.

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