Zhang Jiabo, a four-year-old boy, takes part in a roller skating challenge held in Wangmangling scenic area in North China's Shanxi province, April 20, 2016. The little boy and his 39-year-old father drew much attention recently for their 500 kilometer trip on roller skates, which started from Henan's Puyang city on March 22 and ended at Tian'anmen Square in Beijing on April 4. [Photo/IC]