Shield boss and solar panel: what they have in common

1. Step 1. Shield boss — is part of — Shield. A metal plate above the handle.
2. Step 2. Shield — is made of — Leather. Leather on a wooden base.
3. Step 3. Leather — is material for — Helmet. Helmet liners and simple helmets were made of leather.
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 — Solar panel. Solar panels.

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