Print engine and heron’s aeolipile: what they have in common

1. Step 1. Print engine — is part of — Printer. A laser, inkjet or dot-matrix unit.
2. Step 2. Printer — works like — Gutenberg printing press. A printer is a personal printing press: it transfers an image onto paper.
3. Step 3. Gutenberg printing press — uses — Paper. The impression is made on paper.
4. Step 4. Paper — is material for — Rocket. The first rockets were paper tubes filled with gunpowder.
5. Step 5. Rocket — uses — Reaction force. A rocket moves by reaction force.
6. Step 6. Reaction force — is used in — Heron’s aeolipile. Jets of steam spin the ball by reaction force.

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