Yan Jiashuo, 10, displays her certificate of 'International Master of Memory' at Yanliu primary school in Jinan city, Shandong province, on Dec 21, 2015. Yan becomes the world's youngest contestant to receive the award after she correctly remembered 1,080 irregular figures within an hour and 646 cards in random order. She scored more than 3,000 points in 10 sub-categories at the 24th World Memory Championships in Chengdu, Sichuan province, on Dec 18. [Photo/Xinhua]

Yan Jiashuo remembers a pack of cards in random order within two minutes, in Jinan city, Shandong province, on Dec 21, 2015. Yan is the youngest among the more than 200 Master of Memory around the globe, and 90 contestants who were awarded the title of International Master of Memory in this year's championships. [Photo/Xinhua]

Yan Jiashuo remembers irregular figures in Jinan city, Shandong province, on Dec 21, 2015. The World Memory Championships, which has taken place every year since 1991, is a competition of mental sports in which competitors memorize as much information as possible within a given period of time. [Photo/Xinhua]