Saucepan body and glasses: what they have in common

1. Step 1. Saucepan body — is part of — Saucepan. A cylindrical container.
2. Step 2. Saucepan — is made of — Bronze. Ancient cauldrons were bronze and copper.
3. Step 3. Bronze — is material for — Reflecting telescope. Newton’s mirror was made of speculum metal.
4. Step 4. Reflecting telescope — is a kind of — Telescope. A telescope.
5. Step 5. Telescope — evolved from — Glasses. The first telescopes were assembled by spectacle makers.

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