Stereotactic head frame and telephone: what they have in common

1. Step 1. Stereotactic head frame — is part of — Gamma Knife. It holds the head precisely in place.
2. Step 2. Gamma Knife — uses — Radioactivity. Cobalt-60.
3. Step 3. Radioactivity — is used in — Geiger counter. It detects particles.
4. Step 4. Geiger counter — has part — Loudspeaker. Clicks for every particle.
5. Step 5. Loudspeaker — is part of — Telephone. The earpiece reproduces the other person’s voice.

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