Face Shields Ineffective at Trapping Aerosols, Says Japanese Supercomputer - Slashdot > A simulation using Fugaku, the world's fastest supercomputer, found that almost 100% of airborne droplets of less than 5 micrometres in size escaped through plastic visors of the kind often used by people working in service industries. One micrometre is one millionth of a metre. #covid19 #masks