Statistics Quiz • by Ronald Hurst Which profession, which routinely crosses many time zones and is required to be awake at times both day and night, has a very high incidence of sleep disorders? Ships' captains Austronauts Airline pilots Train conductors ? ? ? Sign up for Zadavaka and get these hints!
You may also like Personality test Everyone has a deep fear that they've never told anyone about. What's yours? Take this image test to find out. Article Discover a dozen mind-expanding tree facts to realize the power, beauty, and importance of trees.