Plastic bottle and sonar: what they have in common

1. Step 1. Plastic bottle — is made of — PET. A PET bottle.
2. Step 2. PET — is material for — Floppy disk. The disk is Mylar (PET) with a magnetic coating.
3. Step 3. Floppy disk — evolved into — USB flash drive. It replaced floppy disks.
4. Step 4. USB flash drive — has part — Microcontroller. A memory controller.
5. Step 5. Microcontroller — is part of — Parking sensor. A microcontroller calculates the distance.
6. Step 6. Parking sensor — works like — Sonar. Echolocation in air.

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