As Victor Hugo once said, Laughter is the sun that drives winter from the human face, and up to now nobody has been able to do this better than Charlie Chaplin.
While the effect of cow's milk harvested at a different time has not been tested on humans up to now, taking melatonin drugs has been suggested to those who are struggling to fall asleep at night.
Up to now, historians have assumed that calendars came into being with the advent of agriculture, for then man was faced with a real need to understand something about the seasons.
The word yet means up to now or at this point but it also gives us the hope and the feeling that it can change it might change tomorrow, it might change next week.