Mouthpiece and liquid-propellant rocket engine: what they have in common

1. Step 1. Mouthpiece — is part of — Whistle. A channel for blowing in air.
2. Step 2. Whistle — uses — Resonance. Resonance of the chamber.
3. Step 3. Resonance — is used in — Quartz clock. Resonance of the crystal.
4. Step 4. Quartz clock — is made of — Silica (sand). The resonator is a quartz crystal.
5. Step 5. Silica (sand) — is material for — Space Shuttle. The heat-shield tiles are silica fibre.
6. Step 6. Space Shuttle — has part — Liquid-propellant rocket engine. Hydrogen-fuelled main engines.

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