Remember: there has never been a single fact, theory, or model that science has been able to prove beyond all doubt, and as long as the scientific method is utilized, this will remain the case forever.
Science can't prove shit. Never has, never will.
I know enough to know that I know nothing at all.
I'm sorry, but I think that's a stupid thing to say.
Of course you know things in some context or another, and you even know things absolutely in some context or another.
You know you exist in the context of your experience. If you don't, you're insane. It's directly evident -- so evident, in fact, that you know this before you could even generate the electrical signal to generate the thought in your head that you know you exist.
Direct experience. i.e. a direct subject/object relationship begets absolute information (and thus, absolute knowledge) about that relational system. It's there. All you need to do is stop being insane and acknowledge it.
I'm honestly saying this respectfully, because I've said your exact words in the past...until I realized they were insane.
I don't know I exist and I don't even know if I'm sane.
Dude. Just look at the sentence you formulated. It's a pile of contradictory horseshit.
"I know enough" to know that "I know nothing at all." Your conclusion? Enough = nothing. Is there some validity to this? Yes. But you don't start from that perspective to explain things. That's called condition-level logic. You need to start with a higher logical vantage point and look down upon condition-level logic to see it clearly and explain it.
Consider the following: We are 3-dimensional beings. What do we know of the 2nd dimension? Well, it's pretty easy to learn about it. Our world is made up of literally an infinite number of 2-dimensional surfaces. Length and width...wow...hard stuff.
But what about the 4th dimension? This is a little bit trickier. We can't see a 4-dimensional object, so how can we learn about one? Well, we could draw a tesseract on a piece of paper! This gives us some information about 4-dimensional objects. How? Because what we did is that we, as 3-dimensional beings, took conceptual, mathematical knowledge of 4-dimensional objects and quite literally thrust them into the 2nd dimension into a logical realm infinitely beneath our own.
In this way, it is possible to talk about the Universe in an absolutely true way using a set of hologrammatically similar languages.