You don't know...

...what you don't know...

We all know that the Americans are picky to the point of paranoia about whom they allow into their country, but when he applied for a Green Card, Sir Paul Nurse had no reason to suspect that he would be deemed an undesirable.

The Nobel Prize-winning geneticist had not only lived in America for three years, but is president of Rockefeller University New York – a powerhouse of American research, so when his application was turned down by the Department of Homeland Security, he assumed that it was nothing more than a bureaucratic blip.

"I know they have high standards," he joked, "but this is ridiculous."

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