Hook point and electronic calculator: what they have in common

1. Step 1. Hook point — is part of — Fish hook. A sharp end that enters the fish’s lip.
2. Step 2. Fish hook — is made of — Bronze. Bronze, then steel hooks.
3. Step 3. Bronze — is material for — Reflecting telescope. Newton’s mirror was made of speculum metal.
4. Step 4. Reflecting telescope — includes — Space telescope. Hubble is a reflector.
5. Step 5. Space telescope — has part — Solar panel. Solar panels.
6. Step 6. Solar panel — is part of — Electronic calculator. Many run on a solar cell.

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