it is designed to help us narrow the large list of available options down to only the best. and it is quite a rush; in a vigorous cough, the air travels out at nearly the speed of sound, creating the barking or whooping noise that we call a cough. they can also develop gray or black strings, which are most disagreeable. red dot sights have less of a tube effect. it’s as much part of your windows and doors as the glass and the frame. “i think it would be programs that we think are nice to have that are not critical,” smith said. 