Fish hook barb and industrial robot: what they have in common

1. Step 1. Fish hook barb — is part of — Fish hook. A reverse barb keeps the fish from getting off.
2. Step 2. Fish hook — is made of — Bronze. Bronze, then steel hooks.
3. Step 3. Bronze — is material for — Helmet. Ancient helmets were copper and bronze.
4. Step 4. Helmet — is made of — Kevlar. Modern ones are aramid.
5. Step 5. Kevlar — is material for — International Space Station. The micrometeoroid shielding is Kevlar and Nextel.
6. Step 6. International Space Station — has part — Industrial robot. The Canadarm2 robotic arm.

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