Wearing a mask can help prevent the spread of viruses such as SARS-CoV-2, but a mask’s effectiveness depends on how well it fits. Currently, there are no simple ways to measure the fit of a mask, but a new sensor developed at MIT could make it much easier to ensure a good fit. The sensor, which measures physical contact between the mask and the wearer’s face, can be applied to any kind of mask. Using this sensor, the researchers analyzed the fit of surgical masks on male and female subjects,…