Home shop machinists know dust shields are important for keeping swarf out of expensive linear rails and ball screws. [Petteri Aimonen] demonstrates three inexpensive ways to DIY some bellows-style… ...

Without a mask, droplets from the simulated cough flew more than 8 feet and up to 12. They traveled 3 feet when the bandanna was worn; 15 inches with the folded handkerchief; and 8 inches with the ...