Test tube and computer: what they have in common

1. Step 1. Test tube — is made of — Glass. Glass.
2. Step 2. Glass — is material for — Capacitor. A Leyden jar is a glass vessel.
3. Step 3. Capacitor — is part of — RAM. A DRAM bit is stored in a tiny capacitor.
4. Step 4. RAM — is part of — Computer. RAM.

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