Discover – June 2019

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“Evolution isn’t about being the best at
something; it’s about being good enough
to survive. The notion of survival of the
fittest is really misleading.”
— Michael Baym, a Harvard University microbiologist
who studies the evolution of antibiotic resistance
AZ
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018
THE CRUX
18 DISCOVERMAGAZINE.COM
With the topic of immigration taking over the news, University of Washington
researchers wanted to figure out a way to accurately count migrants around the
world. Using a new statistical method that they developed, the team looked at
migration trends from 1990 to 2015. They found that, as the world’s population
kept climbing, the rate of people relocating to another country has remained
steady, at just over 1 percent. For example, from 2010 to 2015, about 85 million
people (out of a global population of 7 billion) crossed an international border
to a new home. That’s compared with 69 million from 1990 to 1995, when the
global population was 5.3 billion. The researchers also found that 1 in 4 of
these international moves is a migrant returning to their homeland. Here, the
researchers show global migration flow, in millions of people, by region, from
2010 to 2015.
Migrants of the World
Source: “Estimation of
emigration, return migration,
and transit migration
between all pairs of
countries,” Proceedings
of the National Academy
of Sciences, 2019
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