I suppose in order to make it easier to tell the different denominations of bills apart
quickly. With different faces one can easily distinguish a ten from a twenty, etc.
Even people who can't read can learn that the different faces have different values.
I am guessing you are thinking of Mt. Rushmore . You could also be thinking of coins and paper money and older US stamps.
Crane Paper in Massachusetts.
yes, Us money is made out of a type of special money.
US paper money is called "greenbacks" because the images are printed in green ink on the back.
US paper money is not printed on standard paper. It is printed on a specialized cotton blend and contains no paper.
They are not all presidents, e.g. Franklin, Chase.
liberty
yes because china made paper money first.
None
If by paper money you mean banknotes such as the dollar bill Yes they do.
Paper money is made from a blend of 75% cotton and 25% linen fibers to make it last longer.
US currency paper is composed of 25% linen and 75% cotton.