Cathode (lithium metal oxide) and sickle: what they have in common

1. Step 1. Cathode (lithium metal oxide) — is part of — Lithium-ion battery. The lithium metal oxide cathode gives up ions during charging.
2. Step 2. Lithium-ion battery — is part of — Electric bicycle. A battery.
3. Step 3. Electric bicycle — has part — Roller chain. The chain drive from the pedals remains.
4. Step 4. Roller chain — is part of — Combine harvester. Chain drives power the working parts.
5. Step 5. Combine harvester — evolved from — Sickle. The machine replaced reaping by hand.

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