Second, the map shows that the majority of the world’s population lives in the Northern Hemisphere–where most of the land is—and the temperate climate zone.

Today, latitude and longitude are both determined electronically through GPS — a worldwide system of navigation with a constellation of 24 satellites and their ground stations.

I've seen lots of tornado maps and charts over the years, but these are the first ones I've seen that show the frequency of U.S. tornadoes by latitude and longitude lines. The maps were created by ...