Cork and telescope: what they have in common

1. Step 1. Cork — uses — Elasticity. The elasticity of cork.
2. Step 2. Elasticity — is used in — Hairpin. Elasticity.
3. Step 3. Hairpin — is made of — Bone. Ancient hairpins were bone.
4. Step 4. Bone — is material for — Spectacle frame. The first frames were made of bone and horn.
5. Step 5. Spectacle frame — is part of — Glasses. A frame.
6. Step 6. Glasses — evolved into — Telescope. The first telescopes were assembled by spectacle makers.

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