In which decade did the U.S. government begin to conduct research on healthy participants (who were called "Normals", as opposed to sick patients)?

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The U.S. government began conducting research on healthy participants, called "Normals", in the 1950s, as part of the Cold War effort to study the effects of nuclear fallout. This led to the establishment of the National Institutes of Health's Clinical Center in 1953, which continues to conduct research on healthy volunteers to this day.

In Which Decade Did the U