Pliers and dewar flask: what they have in common

1. Step 1. Pliers — is made of — Bronze. Ancient tongs were bronze.
2. Step 2. Bronze — is material for — Reflecting telescope. Newton’s mirror was made of speculum metal.
3. Step 3. Reflecting telescope — has part — Mirror. The primary mirror.
4. Step 4. Mirror — is part of — Vacuum flask. The silvering reflects heat radiation.
5. Step 5. Vacuum flask — evolved from — Dewar flask. A household Dewar flask.

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