Ski tip and internal combustion engine: what they have in common

1. Step 1. Ski tip — is part of — Skis. A bent end.
2. Step 2. Skis — evolved into — Snowboard. Riding down snow.
3. Step 3. Snowboard — is made of — Fibreglass. It is sheathed in fibreglass.
4. Step 4. Fibreglass — is material for — Jet ski. The hull is fibreglass.
5. Step 5. Jet ski — has part — Internal combustion engine. An engine.

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