Wood and rocket: what they have in common

1. Step 1. Wood — is material for — Wing. The first wings had a wooden frame.
2. Step 2. Wing — is part of — Space Shuttle. It landed like a glider.
3. Step 3. Space Shuttle — has part — Solid rocket motor. Boosters.
4. Step 4. Solid rocket motor — evolved from — Rocket. Gunpowder rockets.

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