As China’s most important national examination, known as gaokao, looms, many students are flocking to hospitals to inhale oxygen in the belief that doing so will “recharge” their brains. Gaokao refers to the country’s national university entrance exam which takes place between June 6 and 8 every year. Many people believe it can make or break a young person’s future since scores in the test will largely determine in which university and what major a student can study. In the past few years,...