Africa is the only continent in the Eastern, Western, Northern and Southern hemispheres.
There is more genetic variation arising in the human species from within Africa than in the rest of the world combined.
There are many cool features about this map. Land masses are very nearly undistorted and no land mass is cut. Any straight line within the bounds of the map is very nearly on a geodesic (great circle). And of course you see the entire surface of the earth without spinning a globe or turning a page.
Are you suggesting that the wealth and GDP of a continent are positively correlated with its area? How bizarre...
I guess somebody forgot to tell Antarctica.
Also, on this map, the southwest US overlaps a very densely populated and well-watered part of Africa.