Throwing arm and smartphone: what they have in common

1. Step 1. Throwing arm — is part of — Trebuchet. A long arm with a sling.
2. Step 2. Trebuchet — uses — Counterweight. A falling counterweight swings the throwing arm.
3. Step 3. Counterweight — is used in — Forklift. A counterweight.
4. Step 4. Forklift — evolved into — Warehouse robot. Automating warehouses.
5. Step 5. Warehouse robot — has part — Lithium-ion battery. A battery.
6. Step 6. Lithium-ion battery — is part of — Smartphone. Power comes from a lithium-ion (lithium-polymer) battery.

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