Radiotracer vial and hammer: what they have in common

1. Step 1. Radiotracer vial — is used in — PET scanner. A tracer with a positron-emitting isotope.
2. Step 2. PET scanner — has part — Photodiode. Photodetectors register the scintillations.
3. Step 3. Photodiode — is part of — LIGO. A photodetector of the interference.
4. Step 4. LIGO — is a kind of — Interferometer. An interferometer.
5. Step 5. Interferometer — is made of — Stone. Michelson’s instrument stood on a stone slab.
6. Step 6. Stone — is material for — Hammer. The first hammer was a hammerstone, later mounted on a handle.

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