Scientists Say: Placebo
This is a substance or procedure that is supposed to have no medical effect
![a small glass beaker full of pills of different shapes, sizes and colors](https://www.snexplores.org/wp-content/uploads/2021/04/1030_SS_placebo_feat.png)
When scientists want to find out if a new pill for pain works, they may compare it against a placebo — a pill that doesn’t have any painkiller in it.
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