Dry cleaning and telescope: what they have in common

1. Step 1. Dry cleaning — uses — Distillation. Recovering the solvent.
2. Step 2. Distillation — is used in — Ethanol. It is concentrated by distillation.
3. Step 3. Ethanol — is material for — V-2 rocket. The fuel is ethyl alcohol.
4. Step 4. V-2 rocket — has part — Gyroscope. A gyroscopic guidance system.
5. Step 5. Gyroscope — is part of — Space telescope. Pointing gyroscopes.
6. Step 6. Space telescope — is a kind of — Telescope. A space telescope is a telescope above the atmosphere, so air does not blur the view.

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