I seriously considered at some point, in my (former) field many top researchers lived in Philly, New York, Boston + Toronto. Becoming a top researcher means travelling where other top researchers are.
Eventually decided it was not worth it for me (had other priorities in life), but this is a sacrifice many EU researchers make (or should I say, made) to become top researchers.
The US is trading science and reason for zeal and faith. At least the scientists will be welcomed in the EU.
Why did they leave the EU in the first place
I seriously considered at some point, in my (former) field many top researchers lived in Philly, New York, Boston + Toronto. Becoming a top researcher means travelling where other top researchers are.
Eventually decided it was not worth it for me (had other priorities in life), but this is a sacrifice many EU researchers make (or should I say, made) to become top researchers.
Most probably money
Operation Paperclip back in the day. Grants and such recently.