Glass bottle and kite: what they have in common

1. Step 1. Glass bottle — evolved into — Plastic bottle. A replacement for glass.
2. Step 2. Plastic bottle — is made of — PET. A PET bottle.
3. Step 3. PET — includes — Polyester. Polyester fibre is PET.
4. Step 4. Polyester — is material for — Hang glider. The sail.
5. Step 5. Hang glider — is a kind of — Glider. A glider.
6. Step 6. Glider — evolved from — Kite. Lilienthal and Cayley studied the wing with kites and gliders.

Open Evothings