Ball and fuel cell: what they have in common

1. Step 1. Ball — is used in — Tennis racket. A ball.
2. Step 2. Tennis racket — is made of — Carbon fibre. Modern frames.
3. Step 3. Carbon fibre — is material for — Hydrogen car. The tanks are carbon fibre.
4. Step 4. Hydrogen car — has part — Fuel cell. A fuel cell.

Open Evothings