Quantum Mechanics

The Quantum Mechanics blew my mind.
It was such an interesting yet confusing topic.
I have never learned anything like it in any of my subjects.

The video about 'the Double Slit Experiment was so fascinating.
How could electrons, which is in a form of particle act as wave?
How can it spilt itself, then bounce off of each other and make wave?
Actually, at this point, I understood it could be that way: electrons behaving as waves.
However, when they said the electrons behaved like the particles like they knew they knew they were being watched, I thought it was joking.
How can that be possible?
How can watching or observing affect what's happening?
Well, I guess these things exist in subatomic level.
After I realized it was real, it amazed me, how observing or measuring could interfere with the data itself.
This leads to the meaning that probability holds at the subatomic level.
Particles can be existed in all state, until it is measured.
Measurement cancels the probabilty, because as you measure you are interfering with the particles.

The best example for this is, the Schrodinger's Cat.
I actually got how this could work.
It really amazed me.
A cat is placed inside a closed box.
It could die inside or live. There's probablity to it.
Cats are living organism, which means we cannot predict what they are going to do.
Because of this, we cannot open the box to observe the cat, because you cannot predict that cats will ignore us completely and act like we are not there.
The cat is somehow going to react to our presence, which means we are messing up the probablity of what the cat might do when it is alone.
Wow, this is very wordy, but this is how I understood it, which could also mean that I don't understand this completely.
Who doesn't?
This concept, or prediction, or whatever it could be, is so out there that we cannot possibly understand.