Present-moment living, getting in touch with your now, is at the heart of effective living. When you think about it, there really is no other moment you can live. Now is all there is, and the future is just another present moment to live when it arrives. One thing is certain, you cannot live it until it does appear.
If all people are unique, and if they are constantly changing each and every day, then all one can say about any social research finding is that it applied to that group of people on that given day, and given the propensity of humans to be different and to change, then it is unlikely that one would get the same results if one were to repeat the study.