The United Kingdom is the latest in a long list of countries to make mask wearing mandatory to slow down the spread of COVID-19, with face coverings compulsory on public transport starting Monday.
A smile is an easy way to defuse social tensions, but is this still possible when a mask is covering the bottom half of our face? And will the emotions of the people we encounter be harder to decode?
How does wearing a mask shape how we interact or communicate with others? CNN spoke to communications...