Do I, personally, have the answers to all questions? Absolutely not.

Can I find answers to all questions? Absolutely.

Are the answers correct? That all depends on the question, doesn't it?

What makes you think human don't utilize 100% of their brain? What part are they not using and how do you know this?

What part of the physical world do we not understand? I'd be interested in how you answer this. Are you comfortable with the idea we will never know all the answers?

For example, barring the invention of a time machine, we will never know how life got started on the earth. Life will be created in labs in the next few years and if we ever travel to other planets, we may very well observe life starting there. But those observations will not tell us with 100% certainty that is how earth-based life began.

We may have all sorts of good explanations how it might have started, but we'll never really know. But does that not knowing really MEAN anything? I don't think so because we have a pretty good idea how life evolved from that unknowable beginning. While studies about abiogenesis will never provide the absolute answer, such studies do tell us a lot about living matter as it exists today.

Science is quite comfortable knowing there are things we can not know with absolute certainty and doesn't insist on faith to provide those answers. No scientist worth his salt throws up his hands and says, "Some magic man one it!"

Besides, who knows... Someone might build that time machine.