Is the coronavirus spreading more in the air than on surfaces?

It may seem surprising, but more than a year after the coronavirus pandemic began, we still don’t know the importance of the various ways to catch Covid-19: by touching contaminated surfaces or by inhaling.

In March, the UK government recommended that face coverings were generally not needed and that people should focus on frequent hand washing, using hand sanitizer and wiping surfaces.

Since then, it has been shown that the virus can spread through the air, not just through larger …