A Chinese man needs two million yuan (US$285,000) to pay for his wife’s cancer treatment has been unexpectedly gifted 50 tonnes of sweet potatoes by a mystery donor. He began selling the starchy root vegetables at a street stall and used the proceeds to pay his wife’s medical bills, moving countless people on mainland social media. Recently, 35-year-old Jia Changlong was spotted selling the potatoes in Jinan, Shandong province in northern China. Jia, from Dezhou, Shandong, and his wife, surnamed...