The 70-meter Spit

Spitting is a national habit in China. The Public Health Bureau of the Fengxian district in Shanghai wanted an anti-spitting public awareness campaign targeting migrant workers in Shanghai. Most migrant workers have learnt that sputum in spit contains germs that spread diseases. But many do not know that the wind also helps to carry germs that are in the spray of the spit further away. According to the bureau, germs can spread to as far as 70 metres depending on wind conditions. How do we make workers see this? The solution is simple: make the germs visible.