He theorized that with the use of watercraft, people gradually colonized unglaciated refuges and areas along the continental shelf exposed by the lower sea level.
During the previous downswing the percentage of full-time MBA programmes reporting higher applications soared as tech stars switched to textbooks (see chart).
The same disjuncture between personal experience and general perceptions is evident when it comes to crime, fear of which has increased even as incidence has fallen.
In most developed countries, where there are available data, yearly working hours have fallen drastically since the end of the 19th century: today we work only about half as much as we did then.