Many bald people wax and shine their heads using bowling-ball shining machines.
A hair is a protein secretion by a tiny gland called a hair follicle. These glands can die, at which point you lose the hair in that location.
Because of the oil naturally present in human skin.
Because the usually have a receding hairline. Their dark skin hides the stubble nicer than light skin guys.
It is not shiny at all.