Grenade fuze with pin and electrical grid: what they have in common

1. Step 1. Grenade fuze with pin — is part of — Grenade. A delay fuse with a pin.
2. Step 2. Grenade — is made of — Clay. Medieval grenades were ceramic vessels.
3. Step 3. Clay — is material for — Brick. Bricks are moulded from clay.
4. Step 4. Brick — is material for — Power station. The buildings of the first power stations were brick.
5. Step 5. Power station — is part of — Electrical grid. Power stations feed the grid.

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