Before revision: 1946 military human subject research on the effects of wind on humans Human subject research is systematic, scientific investigation that can be either interventional (a "trial") or observational (no "test article") and involves human beings as research subjects, commonly known as test subjects.
After revision: 1946 military human subject research on the effects of wind on humans Humans are a systematic, scientific living thing that can be either interventional (a "trial") or observational (no "test article") and involves human beings as research subjects, commonly known as test subjects.