Sawdust and rocket: what they have in common

1. Step 1. Sawdust — is material for — Ice house. Thermal insulation of the ice.
2. Step 2. Ice house — uses — Heat transfer. Thick walls and earth slow down heat transfer.
3. Step 3. Heat transfer — is used in — Heat shield. It protects by carrying heat away with a vaporizing layer.
4. Step 4. Heat shield — is part of — Space Shuttle. Heat-shield tiles.
5. Step 5. Space Shuttle — has part — Solid rocket motor. Boosters.
6. Step 6. Solid rocket motor — evolved from — Rocket. Gunpowder rockets.

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