The World Health Organization (WHO) protested against the use of masks of the public after the coronavirus was detected in India. WHO Executive Director Dr Mitchell Ryan said that the mask does not necessarily protect you. Experts in England had also reiterated some similar things, but many things have changed since then. The Director-General of WHO asked governments to encourage the common people to wear masks where there is the widespread of the virus and it is difficult to keep physical distance such as in public transport, shops and congested environments. Now the mask has become the most important weapon in the fight against the coronavirus. Many researches have confirmed this. Various studies reported that, It is necessary for everyone to wear a mask: Covid-19 deaths in the US in early May were 50 times higher than in Japan, while subways and businesses in Japan were started again. Now the question raised, whether it was just because Japanese wear masks? Several recent studies suggest that masks actually prevent the virus from spreading. US computer scientist De Kai has published a research paper. In which he has told that if 80 percent of people wear masks, then the number of infections will fall by about 92 percent. But if only 30-40 percent of people wear masks, then there will not be much beneficial effect. The University of Cambridge said in its research that if someone wears masks outside the home, the second wave of epidemics can be avoided. This means that the second round of lockdown is not necessary. Both life and livelihood will be saved. Experience over the past century suggests that masks are effective in preventing infection. According to Lancet, the bacteriologist Carl Flug demonstrated in the 1890s that respiratory droplets contained bacteria. In 1897, his colleague and surgeon Johan Mikulicz began using masks during the operation. By 1935, almost all surgeons started wearing facial masks. According to another CNN report, the mask was considered effective during the Manchurian plague of 1910–1911. The mask was made mandatory by San Francisco during the Spanish flu pandemic of 1918–20. Those not doing so faced a fine of $ 5–100 and a jail term of 10 days. Mask reduces risk Research at the University of Iowa shows that the mask reduces the risk of 90 percent of buds caused by cough. There are many more benefits of masks. These prevent the drops of breath from reaching your eyes. This ensures that you cannot touch your face with your hands. Some experts say that if you are infected, a mask will be helpful in stopping your breath drops. 'What does the conversation mean?' asks Adhir Ranjan on Army Chief's statement over 'China border dispute' - Bumper Recruitment for the posts of Excise Assistant Inspector and Constable, pass the 12th application Police issue notice against Jarful Islam for his controversial post