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Shakuntala Devi is a famous mathematician of the 20th century. She managed to book her name in The Guinness Book of World Records, 1982 after doing a 13-digit multiplication in just 28 seconds. Director Anu Menon has directed her biopic, whose trailer is out. Actor Vidya Balan has played the role of Shakuntala Devi in the movie. If you want your child to be as smart and intelligent as her, make her try these food items.