We can't kill Nicole Simpson all over again. But we can look at the clues and figure out that OJ did it. That's how it is with any historical science. Life on Earth developed over time, and all species are related. Those are facts.
No. those are what YOU think are facts. They can not be empirically reproduced scientifically, so SCIENTICALLY, it is thus only a THEORY. Unless you can scientifically, empirically reproduce what you conjecture, then it's NOT FACT, IT'S THEORY. That's why it's called the "Theory of Evolution", not the "Fact of Evolution".