Mail Processing at the USPS

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Mail Processing at the USPS

During a hectic night of mail processing at the post office,
a number of letters fell off an elevated conveyor belt and
scattered onto the floor. Before the area supervisor had a
chance to pick them up, the facility manager, who had a
reputation for being stern, came upon the scene.

"Why is this mail on the floor?" he demanded angrily.

Without hesitation the supervisor replied, "Gravity, sir."