The foreword offers a very interesting perspective into the pre-Apollo era, where weightlessness, had not yet been achieved:
“Weightlessness, the weird condition of subgravity which man has never before experience and survived — except for the initial split-second of short distance free fall — has recently become a major field of serious scientific research. Man now approaches this condition as his fast-climbing fighter flattens out to intercept an enemy bomber, and he may soon experience it for a long duration on multimonth interplanetary excursions.”
https://documents.theblackvault.com/documents/afhistory/ADA323144.pdf
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