Footwear e telescope: o que têm em comum
- Passo 1. Footwear — é feito de — Plant fibre. The oldest sandals (Fort Rock) were woven from sagebrush bark.
- Passo 2. Plant fibre — é material para — Toothbrush. The bristles were hog hair, later nylon.
- Passo 3. Toothbrush — é feito de — Osso. Addis’s toothbrush has a bone handle.
- Passo 4. Osso — é material para — Spectacle frame. The first frames were made of bone and horn.
- Passo 5. Spectacle frame — faz parte de — Óculos. A frame.
- Passo 6. Óculos — evoluiu para — Telescope. The first telescopes were assembled by spectacle makers.