Yoke bows and LIGO: what they have in common

1. Step 1. Yoke bows — is part of — Yoke. Bows that go around the animals’ necks.
2. Step 2. Yoke — is used in — Plough. It was pulled by oxen in a yoke.
3. Step 3. Plough — evolved from — Hoe. The plough mechanized loosening the soil with a hoe.
4. Step 4. Hoe — is made of — Stone. The working part was of stone or antler.
5. Step 5. Stone — is material for — Interferometer. Michelson’s instrument stood on a stone slab.
6. Step 6. Interferometer — includes — LIGO. An interferometer.

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