Floppy disk and lead–acid battery: what they have in common

1. Step 1. Floppy disk — evolved into — USB flash drive. It replaced floppy disks.
2. Step 2. USB flash drive — has part — Microcontroller. A memory controller.
3. Step 3. Microcontroller — is part of — Parking sensor. A microcontroller calculates the distance.
4. Step 4. Parking sensor — works like — Sonar. Echolocation in air.
5. Step 5. Sonar — is part of — Submarine. Underwater acoustics.
6. Step 6. Submarine — has part — Lead–acid battery. Underwater, electric motors run on batteries.

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