Shower and laser: what they have in common

1. Step 1. Shower — uses — Water heater. Hot water.
2. Step 2. Water heater — has part — Thermostat. A thermostat.
3. Step 3. Thermostat — is used in — PCR. A thermal cycler changes the temperature in cycles.
4. Step 4. PCR — is used in — DNA sequencing. Preparing samples.
5. Step 5. DNA sequencing — uses — Laser. Fluorescent sequencing.

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