It looks like a cultish gathering of smartphone users, and in many ways it is: this image shows African migrants on the shore of Djibouti, holding their phones aloft to snatch cheap phone signal from nearby Somalia.
On highway medians, atop old landfills, in backyards—these are some of the places a monarch butterfly revival could begin. The yearly migration of monarchs from the northern U.S. and Canada to the warmer environs of Mexico was once a spectacular sight, and a now a rare one. Their numbers have dwindled. There’s no single cause, but a major one is habitat loss.
The basic shape of urban growth is easy to spot; we look at the fastest-growing cities, for example, or immigration numbers. But yesterday, Facebook’s Data Science team revealed a less obvious pattern: Mass coordinated migration, where a group from the same city moves to another. Who are the winners and losers in this urban game?
Each year, 10 million Americans pack up their lives and move to another part of the country. But where are they going? The University of Wisconsin-Madison has made an awesome interactive map that tracks the net migration to different counties across the U.S.