Aadhav Karthikeyan (born on May 26, 2016) of Madurai, Tamil Nadu, is appreciated for writing English alphabet with corresponding words, ten colours, numbers from 1-20 in words, 24 fruits, eight shapes, and days of the week, without making any spelling error. He wrote everything on a black slate using chalk, at the tender age of 4 years and 3 months, as confirmed on September 25, 2020.