New style

If a BARBER makes a mistake,it's a new hair style.
If a POLITICIAN makes a
mistake, it's a new law.
If a SCIENTIST makes a
mistake, it's a new
invention.
If a TAILOR makes a mistake, it's a new fashion.
If a TEACHER makes a
mistake, it's a new
theory but....
If a STUDENT makes a
mistake, it's a????