Docking and mechanical clock: what they have in common

1. Step 1. Docking — is used in — Soyuz. Docking.
2. Step 2. Soyuz — has part — Heat shield. A heat shield.
3. Step 3. Heat shield — is part of — Space Shuttle. Heat-shield tiles.
4. Step 4. Space Shuttle — is made of — Silica (sand). The heat-shield tiles are silica fibre.
5. Step 5. Silica (sand) — is material for — Quartz clock. The resonator is a quartz crystal.
6. Step 6. Quartz clock — evolved from — Mechanical clock. Quartz clocks replaced mechanical ones: a vibrating quartz crystal took the place of the pendulum and balance.

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