> This would only be surprising if your teacher was a Physics teacher. I'm not sure. Physics teachers often have to deal with absolute laws of physics, e.g. "y

> This would only be surprising if your teacher was a Physics teacher. I'm not sure. Physics teachers often have to deal with absolute laws of physics, e.g. "you can't make a perpetual motion machine". You can't ever demonstrate that something doesn't exist (philosophy of the black swan/inviting disproof by counter-example), so it's challenging for teachers to communicate this as a fact to curious students: the result is sometimes teachers appearing scornful. One slightly-misunderstood law of conservation and you're suddenly a physics teacher who is scorning the truth.