Patent office has not been duped by fans

IMAGINE 15 MILLION people waving fans in the same direction at the same time... That idea appeared on the official website of the State Intellectual Property Office, as a "solution" to free Beijing of smog, because the person applying for a patent argues that so many people waving fans at the same time will produce a wind strong enough to blow smoggy weather away. According to the website, the applicant has passed the first step of patent application process. China Daily writer Zhang Zhouxiang comments:

It seems the person applying for the patent lacks the most basic training in both social and natural sciences. First, having little knowledge about the science of social organization, he or she does not know how difficult it is to get 15 million people together and get them to fan in the same direction at the same time.

Second, a basic calculation has not been done to determine whether the fanning of 15 million people could produce a strong enough wind. Taking air purifiers for comparison, a rough calculation finds that a 700-square-meter hall, with the height of 3 meters, needs more than 500,000 cubic meters of air flow per hour to keep its air clean. Beijing covers 16,000 square kilometers, which means it is about 22 million times the size of the hall, which far exceeds the ability of human fanning to keep its air clean.