Cosmic microwave background and screw press: what they have in common

1. Step 1. Cosmic microwave background — uses — Radio telescope. Detected by a radio antenna.
2. Step 2. Radio telescope — is a kind of — Telescope. A telescope for radio waves.
3. Step 3. Telescope — is used in — Optical telegraph. Signals were read through a telescope.
4. Step 4. Optical telegraph — uses — Lever. The arms were moved by a system of levers and rods.
5. Step 5. Lever — is part of — Screw press. A lever for turning the screw.

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