If you want proof that the modern world is a melting pot, look no further. Streams of migrants moving around the globe have been quantified for the first time and strikingly displayed (see example here) using visualization techniques more associated with genomics. But the figures may surprise many. The overall rate of migration has remained pretty steady, at around 6 people per 1,000 changing their country of residence in each of the three five-year periods between 1995 and 2010. Levels were slightly higher in 1990 to 1995, probably due to conflicts. Read more.