Today I want to discuss some of the arguments that should play a role in the decision for students to send  out an application to a particular principal investigator in a particular institute in, very often, a foreign country.

Mobility
How mobile should a junior scientist be? I know some very successful scientists that went to high school, college and university in the same city. And even became professor at that university, with as their research theme a continuous iteration of their PhD thesis. But I think they form a minority.

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