Gamma Knife and optical telegraph: what they have in common

1. Step 1. Gamma Knife — is a kind of — Radiation therapy. Radiosurgery.
2. Step 2. Radiation therapy — uses — Particle accelerator. Medical linear accelerators.
3. Step 3. Particle accelerator — uses — Electromagnet. Bending magnets.
4. Step 4. Electromagnet — is part of — Electrical telegraph. Morse’s receiver.
5. Step 5. Electrical telegraph — evolved from — Optical telegraph. The electrical telegraph replaced semaphore lines.

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