Infrared seeker and gutenberg printing press: what they have in common

1. Step 1. Infrared seeker — is part of — Guided missile. A seeker.
2. Step 2. Guided missile — evolved from — Rocket. A rocket with guidance.
3. Step 3. Rocket — is made of — Paper. The first rockets were paper tubes filled with gunpowder.
4. Step 4. Paper — is used in — Gutenberg printing press. The impression is made on paper.

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