/sci/ - Science & Math

What are some legit classifications of humans personalities and psyches? the four temperaments? The Myers-Briggs Type? Where do you fall on?

Is it possible to trick my body to start growing? I'm 21 years old and I'm pretty tired of being short. I don't care if I have to shave off 10 years of my life just to be taller. Would human growth hormone work?

Last semester my professor was explaining to me what transformers do, and how every phone or laptop charger has a step-down transformer in them because they couldn't handle the 120 volts coming through the outlet.
What I'm wondering is, was my professor right when he said "It can't handle the voltage"?
This doesn't seem to make much sense to me.
Voltage is like the potential energy of the system,
so how could a system not handle potential energy? Isn't it just as possible to not have the transformers, and instead just have more resistors?