letter carriers and their daily operations

each day our 150,000 letter carriers travel seven times the distance covered by Astronaut John Glenn in his three orbits around the earth postal employees operate approximately 100,000 government owned or hired Vehicles Hey sir each year window clerks sell over 23 billion stamps can I have three one and handle more than 900 million special service transactions the their colleagues working behind the scene are deluged with about 80 billion items of mail nearly 1 half of the world's mail volume and it's increasing by 3 billion items of mail a year mountains of mail and Parcels must be sorted distributed and delivered promptly accurately economically