Rotary printing press and radar: what they have in common

1. Step 1. Rotary printing press — evolved from — Gutenberg printing press. Cylinders instead of a flat press.
2. Step 2. Gutenberg printing press — works like — Printer. A printer is a personal printing press: it transfers an image onto paper.
3. Step 3. Printer — has part — Microcontroller. A controller processes the print job.
4. Step 4. Microcontroller — is part of — Parking sensor. A microcontroller calculates the distance.
5. Step 5. Parking sensor — works like — Radar. A parking sensor, like radar, catches a reflected signal — only ultrasonic.

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