Not to deliver it, but to take the package or envelope, check the address, then put it in a pile to go to a distribution center in the appropriate, proximal zip code of its destination. That done, the mail might wait up to a day to be flown out, two days at times, then another day to be delivered by ground.
Some breeds of dogs have a natural curl or bend to their tails. But others have been selectively bred to take this curl to an extreme, cork-screw shape. Dog breeds with curly tails referred to as screw tails include Boston Terriers, Pugs, Bulldogs and French Bulldogs.
People with curly hair have a flatter follicle. Straight hairs tend to have a rounder follicle. But how a flat follicle turns round, and vice versa, is a mystery. What adds to the curl or takes away from the curl is a fascinating issue scientifically, says Tom Dawson, a principle scientist at P&G Beauty.