Home-made face masks need layers to be effective

Homemade face masks likely need at least two layers to curb Covid-19 spread, according to a new study published in the British Medical Journal.It found preferably three layers of cloth were needed to reduce dispersal of viral droplets from nose and mouth. A team of Australian researchers compared the effectiveness of single and double-layer cloth face coverings, with a 3-ply surgical face mask at reducing droplet spread. They found the surgical face mask was the most effective, followed by a dou