Millions of people have been left stumped by a riddle which '98 per cent of Harvard students' get wrong but most kindergartners can solve. Isabella Avila, 24, took to to share what has been dubbed the 'world's hardest riddle' and it left plenty of people scratching their heads. She claimed 98 per cent of Harvard students get it wrong while 83 per cent of kindergarten-age kids come up with the right answer.
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