What if somebody makes a mistake?

If a BARBER makes a mistake, its a new
hair style..!!
..
..
If a POLITICIAN makes a mistake, its a new
law..!!
..
..
If a SCIENTIST makes a mistake, its a new invention..!!
..
..
If a TAILOR makes a mistake, its a new
fashion..!!
..
..
If a TEACHER makes a mistake, its a new
theory..!!
.
.
and
..
..
If a STUDENT makes a mistake, its a “MISTAKE”