Nebulizer cup and hammer: what they have in common

1. Step 1. Nebulizer cup — is part of — Nebulizer. It turns the medicine into an aerosol.
2. Step 2. Nebulizer — has part — Compressor. A compressor.
3. Step 3. Compressor — is part of — Refrigerator. A compressor with an electric motor.
4. Step 4. Refrigerator — evolved from — Ice house. The refrigerator replaced natural ice.
5. Step 5. Ice house — is made of — Stone. Ice houses were built of stone and sunk into the ground.
6. Step 6. Stone — is material for — Hammer. The first hammer was a hammerstone, later mounted on a handle.

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