Diffraction grating and sewage treatment plant: what they have in common

1. Step 1. Diffraction grating — is part of — Spectroscope. A grating instead of a prism.
2. Step 2. Spectroscope — is used in — Helium. Helium was discovered by spectroscopy in the solar spectrum.
3. Step 3. Helium — is material for — Superconducting magnet. It is cooled with liquid helium.
4. Step 4. Superconducting magnet — is part of — Maglev. Japan’s SCMaglev uses superconducting magnets.
5. Step 5. Maglev — is made of — Concrete. The guideway is concrete.
6. Step 6. Concrete — is material for — Sewage treatment plant. The tanks are concrete.

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