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September 2012 edition of IEEE's
Spectrum magazine has an interesting chart on the last page that shows the percentage of
researchers that immigrate/emigrate to/from 16 different countries versus how many emigrate
from the them. The chart bars represent percentages, not absolute numbers. Switzerland has the
highest number of researchers immigrating to it (~60%)
while about 35% emigrate from it. We don't know whether any of those immigrants stayed a while
and then joined the emigrants ranks. India has the greatest number of researcher emigrants leaving
(~40%) while immigrants relocating to India are almost
immeasurable. China is not included because access to researchers there was too restricted
(gotta love those Communist regimes).