Harp pedals and fuel cell: what they have in common

1. Step 1. Harp pedals — is part of — Harp. Pedals retune the strings by a semitone.
2. Step 2. Harp — has part — Strings. Stretched strings of different lengths.
3. Step 3. Strings — is part of — Tennis racket. A string bed.
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.

Open Evothings