Weightlessness seemed at the time the safer mode. Weightlessness seemed at the time the mode in which we could beat both the clock and affect itself, but I see now that it was not. I see now that the clock was ticking. I see now that we were experiencing not weightlessness but what is interestingly described on page 1513 of the Merck Manual (Fifteenth Edition) as a sustained reactive depression, a bereavement reaction to the leaving of familiar environments.