How fast can you mentally add up numbers? Molly Gambhir speaks to a 13-year-old Indian math genius who has set a Guinness world record. He mentally added 50 five-digit numbers in 25.19 seconds! Watch his interview to find out more.

13-year-old Indian genius sets Guinness World Record; Adds 50 five-digit numbers in 25.19 seconds

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13-year-old Indian genius sets Guinness World Record; Adds 50 five-digit numbers in 25.19 seconds