Lithium-ion battery and joystick: what they have in common

1. Step 1. Lithium-ion battery — is part of — Laptop. A battery.
2. Step 2. Laptop — has part — Solid-state drive. A drive.
3. Step 3. Solid-state drive — has part — Microcontroller. A controller manages the memory.
4. Step 4. Microcontroller — is part of — Gamepad. A microcontroller polls the buttons.
5. Step 5. Gamepad — evolved from — Joystick. A game controller.

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