DNA double helix and turbojet engine: what they have in common

1. Step 1. DNA double helix — is used in — DNA sequencing. Reading DNA.
2. Step 2. DNA sequencing — uses — PCR. Preparing samples.
3. Step 3. PCR — uses — Thermostat. A thermal cycler changes the temperature in cycles.
4. Step 4. Thermostat — is part of — Refrigerator. A thermostat.
5. Step 5. Refrigerator — has part — Compressor. A compressor with an electric motor.
6. Step 6. Compressor — is part of — Turbojet engine. The compressor compresses the air.

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