The FBI claims that mail-sorting equipment crushed the killer anthrax in the letters to Senators Daschle and Leahy down to a fine powder.
So the FBI is trying to say that a mail-sorting machine which is designed to process letters 6,350 microns thick crushed something down to 3 microns . . . 2,116 to 4,232 times smaller than the type of envelope sorting machines are designed to handle (the smaller number is compared to 3 micron thick anthrax powder and the larger is compared to 1.5 micron powder) .
I don't know about you, but my mail isn't crushed into oblivion when I get it.