Bow drill and voltaic pile: what they have in common

1. Step 1. Bow drill — is used in — Fire making. The bow drill is a way of making fire.
2. Step 2. Fire making — evolved into — Match. A convenient way to make fire.
3. Step 3. Match — uses — Chemical reaction. The head flares up from a chemical reaction set off by friction.
4. Step 4. Chemical reaction — includes — Electrolysis. Electrolysis is a chemical reaction driven by an electric current.
5. Step 5. Electrolysis — evolved from — Voltaic pile. The first electrolysis of water was powered by a voltaic pile.

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