The picture on p 4 of your 3 November issue seems to show a US postal worker wearing a 3M filtering face piece (FFP) as protection against the threat of anthrax. The mask is being worn with the bottom ...

A mask is a mask or isn't it? I have tested and owned many, many masks. I still mourn the loss of one of my first masks because it was really tight and I didn't have to blow it out all the time.