Germany tried twice in the 20th century to conquer Europe and very nearly achieved that goal in World War II. In fact, not since Napoleon did any one country control so much of the continent. Here ...

Why do most world maps depict north up top? And how does that tendency shape our perceptions of what is valuable or superior? Gary Nunn explains.

Fig 1. World map showing the distribution of study countries and study participants. Note: Shade of green represents the number of participants per country.