Footwear and telescope: what they have in common

1. Step 1. Footwear — is made of — Plant fibre. The oldest sandals (Fort Rock) were woven from sagebrush bark.
2. Step 2. Plant fibre — is material for — Toothbrush. The bristles were hog hair, later nylon.
3. Step 3. Toothbrush — is made of — Bone. Addis’s toothbrush has a bone handle.
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.

Open Evothings