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The first double-blind study compared polio vaccine to a placebo, in the 1950s
'''Double-blind studies''' are [[experiments]] in which neither the participants nor the [[Scientist|people analyzing the results]] know who is in the control group.
'''Double-blind studies''' are [[experiments]] in which neither the participants nor the [[Scientist|people analyzing the results]] know who is in the control group.
The first double-blind study compared [[polio vaccine]] to a placebo, in the 1950s (see [[Jonas Salk]]).
[[Category:Science]]
[[Category:Science]]