Angioplasty and GPS (satellite navigation): what they have in common

1. Step 1. Angioplasty — uses — X-ray machine. Under X-ray guidance.
2. Step 2. X-ray machine — uses — X-rays. X-rays.
3. Step 3. X-rays — is a kind of — Electromagnetic waves. Short-wave electromagnetic radiation.
4. Step 4. Electromagnetic waves — is used in — GPS (satellite navigation). Radio signals.

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