"I have a teacher, who thinks she knows everything about everything and if you disagree then you are wrong."
- changingtheworld
So you had a teacher.
She was ignorant, okay. Welcome to the wonderful world of the current education system. It's shite. You learn nothing useful and throughout it all what's "right" is constantly changing. At the beginning of every year when I was at school, my teachers would say "everything previously learned was wrong, *THIS* is what's right..."
It's bullshit.
_________________
Only in silence the word,
only in dark the light,
only in dying life:
bright the hawk's flight
on the empty sky.
-Creaton of Éa, Ursula Le Guin