Pocket watch and electric car: what they have in common

1. Step 1. Pocket watch — evolved into — Wristwatch. The watch moved to the wrist.
2. Step 2. Wristwatch — evolved into — Smartwatch. The form factor of a wristwatch.
3. Step 3. Smartwatch — has part — Lithium-ion battery. Powered by a lithium-ion battery.
4. Step 4. Lithium-ion battery — is part of — Traction battery. The battery is assembled from many lithium-ion cells.
5. Step 5. Traction battery — is part of — Electric car. Energy is stored in the traction battery.

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