…at the University of Michigan in the 1960s, anyway.
Michigan required that all PhD students in psychology pass a proficiency test in two foreign languages… [Amos Tversky] picked French. The test was to translate three pages from a book in the language: The student chose the book, and the tester chose the pages to translate. Amos went to the library and dug out a French math textbook with nothing but equations in it… The University of Michigan declared Amos Tversky proficient in French.
from Michael Lewis’s The Undoing Project: A Friendship That Changed Our Minds.