Brick studs and rocket: what they have in common

1. Step 1. Brick studs — is part of — LEGO bricks. Studs on top fit into the tubes of the brick below.
2. Step 2. LEGO bricks — uses — Interchangeable parts. Any brick fits any other.
3. Step 3. Interchangeable parts — is used in — Revolver. Colt used machine production of interchangeable parts.
4. Step 4. Revolver — uses — Gunpowder. Gunpowder propels the bullet.
5. Step 5. Gunpowder — is used in — Rocket. The first rockets were powered by gunpowder.

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