Scissor blades and telescope: what they have in common

1. Step 1. Scissor blades — is part of — Scissors. Two crossing blades.
2. Step 2. Scissors — is made of — Bronze. Ancient scissors were bronze.
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.

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