Dumbbell and personal computer: what they have in common

1. Step 1. Dumbbell — has part — Weight plates. Weights.
2. Step 2. Weight plates — is part of — Electrostatic machine. Counter-rotating discs with sectors.
3. Step 3. Electrostatic machine — is used in — Leyden jar. Charged by the machine.
4. Step 4. Leyden jar — evolved into — Capacitor. The Leyden jar was the first capacitor.
5. Step 5. Capacitor — is part of — RAM. A DRAM bit is stored in a tiny capacitor.
6. Step 6. RAM — is part of — Personal computer. RAM.

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