Nail and radar: what they have in common

1. Step 1. Nail — uses — Wedge. The point of a nail pushes the wood apart.
2. Step 2. Wedge — is used in — Scalpel. The blade.
3. Step 3. Scalpel — is made of — Stainless steel. Stainless steel.
4. Step 4. Stainless steel — is material for — Flight recorder. Stainless steel.
5. Step 5. Flight recorder — is part of — Jet airliner. Flight recorders.
6. Step 6. Jet airliner — has part — Radar. A weather radar.

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