It's why experiments have control groups. You randomly split a group in two and only change one variable. Without a control group there is always reasonable doubt as to the cause of the difference between the two groups. It's why they vaxxed the control groups in the vax trials. Without a control group you can't prove the harm vaccines are doing.
It's why experiments have control groups. You randomly split a group in two and only change one variable. Without a control group there is always reasonable doubt as to the cause of the difference between the two groups.
It's why they vaxxed the control groups in the vax trials. Without a control group you can't prove the harm vaccines are doing.
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