If an appliance you buy fails than you know that it fails. If a drug reduces your IQ by 5 points you won’t know. Drugs also don’t get tested for whether or not they reduce your IQ by 5 points.
If an appliance you buy fails than you know that it fails. If a drug reduces your IQ by 5 points you won’t know. Drugs also don’t get tested for whether or not they reduce your IQ by 5 points.