Nine-year old Zarif Iqbal Walid can calculate anyone's age just by hearing their date of birth. Not only that, he is able to do difficult arithmetic calculations orally, without pen or paper. Locals from his area are amazed by his skills. They call him the "wonder boy".

In today's Inside Bangladesh, watch the story of "wonder boy" Zarif from Faridpur upazila of Pabna.