Rubber core and fuel cell: what they have in common

1. Step 1. Rubber core — is part of — Golf ball. A rubber core.
2. Step 2. Golf ball — is a kind of — Ball. A ball.
3. Step 3. Ball — is used in — Tennis racket. A ball.
4. Step 4. Tennis racket — is made of — Carbon fibre. Modern frames.
5. Step 5. Carbon fibre — is material for — Hydrogen car. The tanks are carbon fibre.
6. Step 6. Hydrogen car — has part — Fuel cell. A fuel cell.

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