China’s winemakers seek their own Napa Valley

YINCHUAN, China — On a fall evening in a fluorescent-lit classroom at Tsinghua University in Beijing, a dozen students listened intently. The speaker, Emma Gao, held a glass to the light and asked them to study the swirling liquid inside. Tsinghua is known as the “M.I.T. of China,” but this was no freshman seminar in fluid mechanics. It was a gathering of the student wine club.