Stop that sneeze by licking the roof of your mouth. You can prevent yourself sneezing by placing your tongue firmly against the roof of your mouth and keeping it there. With practice, you can prevent yourself sneezing, or failing that, at least postpone your sneeze for a good few minutes until you have time to get out a handkerchief, get out of a crowded room or get off the bus. Relevant to Coronavirus, but also to preventing the spread of other common infections. Please pass on this tip, as I have done to UK and Welsh Health Secretaries.