We use most of our brain, we just use 10% at any ONE TIME. If we could use it all at once we'd be thinking about the future, present, doing something, moving, smelling, and remembering all at the same time...that's impossible. There are people who have created worlds inside their brain and they see and feel things. It's called schizophrenia, but it's there. They have entire people or GROUPS of people in their mind that they interact with. So to them, those people ARE there.
We didn't discover math, we invented it. It's possible to use a totally different math system than humans use. We use numbers, which technically with decimals and our measuing system, is inaccurate. If you divide 100 by 3, you get en ever repeating number, which means you can't divide an object into 3 equal pieces. But you put three equal pieces together and you have 1 whole piece divided by 3....hmm somethings wrong there. Think of our math system like a bunch of blocks that can be divided into smaller blocks (decimals, fractions) no matter what you do you can't get 100% accurate measurements of curved objects like that. Personally I think our math sytem is flawed, and we will only be able to advance a certain distance before we have to develope a new math system.
Dark matter...psh that's a load of bull. Scientists can't figure out what they did wrong with their calculations to find missing mass in galaxies, so they invent matter that can't be seen, felt, heard, or anything. Scientists say that because the outer edge of a galaxy doesn't move slower than the inside ( like a solar system), that there must be dark matter there to hold the galaxy together. Maybe it's simply like this: imagaine a record spinning, the outside edge is moving FASTER than the inside to stay attached to the rest of the record. A galaxy has a huge amount of gravity, why wouldn't the record effect apply to a galaxy as well? They are comparing a galaxy to a slolar system, which isn't correct imo. Planets orbit the sun in a solar system, but a galaxy rotates as a whole, with the gravity of it's suns and the black hole in the center holding it together.
If dark matter DOES exist, we should send a probe to where we think some is, (oh wait, we don't know where 99% of the universe is? psh) if it disappears into the "matter" than it's real, if not, well, we've got some dummies on earth.