July - September 2021: In this Newsletter there an article by Remo on the risks / consequences of using mouthwash, an article on the efficacy of facemasks by Muthana and a brief report on the breakthrough on calculating protein structures using AI. There are also interesting travel articles by Roger (Salamanca) and Wayne (his continuing sailing adventures), a "ski-season wrap-up" by Joe and Christian's investment commentary. Finally, there's the humour section. Now that we're able to meet in person, there's also the announcement of the Summer Party - sign up now! My thanks to all the contributors.