CAPTCHA and CNC machine: what they have in common

1. Step 1. CAPTCHA — uses — Optical character recognition (OCR). Distorted text that is hard for OCR.
2. Step 2. Optical character recognition (OCR) — is a kind of — Algorithm. OCR is an algorithm that turns a picture of letters into text.
3. Step 3. Algorithm — is used in — Program control of a machine. A program is a written algorithm.
4. Step 4. Program control of a machine — is used in — CNC machine. The tool’s movement is set by a program — at first on punched tape.

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