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]