Band theory and rocket: what they have in common

1. Step 1. Band theory — is used in — Semiconductor. Band theory explains the properties of semiconductors.
2. Step 2. Semiconductor — includes — Germanium. A semiconductor.
3. Step 3. Germanium — is material for — Infrared seeker. The optics of infrared seekers are germanium and sapphire.
4. Step 4. Infrared seeker — is part of — Guided missile. A seeker.
5. Step 5. Guided missile — evolved from — Rocket. A rocket with guidance.

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