This NASA moving image, recorded by satellite over a full year as part of their Blue Marble Project, shows the ebb and flow of the seasons and vegetation.
The time-old adage is that “The shortest distance between two points is
a straight line.” Most of what we see day-to-day would confirm that. On
paper, you use a ruler, sometimes called a “straight edge,” to connect
two dots. In a field, it’s easy to apply the same principle and cut
straight across. But then why do the network maps for the airlines
always have those funny looking arcs? What happened to those straight lines?