<prompt> Translate the following text to EnglishLakini nadharia kubwa - kwamba watu wenye akili walikuwa wametawanyika katika muundo wa darasa, na sasa wamekusanyika juu - ni karibu haiwezekani kuthibitisha, kwa sababu tu usimamizi wa wingi wa vipimo vya akili ni jambo la hivi karibuni.  <response>: But the larger premise--that intelligent people used to be scattered throughout the class structure, and are now concentrated at the top--is almost impossible to prove, simply because the mass administration of mental tests is such a recent phenomenon. 