Plough beam and LIGO: what they have in common

1. Step 1. Plough beam — is part of — Plough. The beam to which the traces are attached.
2. Step 2. Plough — evolved from — Hoe. The plough mechanized loosening the soil with a hoe.
3. Step 3. Hoe — is made of — Stone. The working part was of stone or antler.
4. Step 4. Stone — is material for — Interferometer. Michelson’s instrument stood on a stone slab.
5. Step 5. Interferometer — includes — LIGO. An interferometer.

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