Gravitational waves and needle: what they have in common

1. Step 1. Gravitational waves — uses — Theory of relativity. Predicted by general relativity.
2. Step 2. Theory of relativity — was inspired by — Interferometer. The Michelson–Morley experiment found no ether.
3. Step 3. Interferometer — has part — Mirror. Mirrors.
4. Step 4. Mirror — is made of — Silver. A silver coating.
5. Step 5. Silver — is material for — Syringe. Early needles were silver.
6. Step 6. Syringe — has part — Needle. A hollow needle.

Open Evothings