COVID-19 January 25, 2021 4:31 pm Health Experts Suggest Wearing Two Masks to Protect Against COVID-19 Health experts say wearing two or three masks is more effective to protect against coronavirus. US & World Videos 1:53 Opening statements begin in the Karen Read trial 2:31 Fallen Billerica Police Sgt. Ian Taylor honored at vigil 2:39 MIT president calls for shutdown of student encampments 0:16 4 people seriously hurt after boat sinks off Cape Cod 2:35 Fallen Billerica police sergeant honored during vigil