Rapid addition of single digit numbers performed by a child while hanging upside down
The record for performing the rapid addition of single digit numbers while hanging upside down was set by Kiaan N. Jain (born on November 26, 2014) of Surat, Gujarat. He mentally added 40 single digit numbers flashing on the screen with a speed of 0.5 seconds while hanging upside down, at the age of 7 years and 8 days, as confirmed on December 4, 2021.