Wedge and hydraulic press: what they have in common

1. Step 1. Wedge — is used in — Stone tool. A sharp edge works like a wedge.
2. Step 2. Stone tool — evolved into — Hammer. The first hammer was a stone in the hand.
3. Step 3. Hammer — evolved into — Steam hammer. A steam hammer is a hammer lifted by steam, used to forge huge parts.
4. Step 4. Steam hammer — evolved into — Forging press. Pressing instead of striking.
5. Step 5. Forging press — is a kind of — Hydraulic press. A press.

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