Pacemaker and hammer: what they have in common

1. Step 1. Pacemaker — is made of — Titanium. The case is titanium.
2. Step 2. Titanium — is material for — Artificial heart. The case is titanium.
3. Step 3. Artificial heart — has part — Piston pump. A pulsatile pump.
4. Step 4. Piston pump — has part — Cylinder. The piston moves in a cylinder.
5. Step 5. Cylinder — is part of — Steam hammer. A steam cylinder.
6. Step 6. Steam hammer — evolved from — Hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.

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