What are "basic facts"? Surely the point of most research is to uncover new facts? And what is "reference material" if not other research - research that you're using as a foundation for your own?
It's fair to question things, especially if they don't make sense to you and even if acknowledged authorities are behind them. However, (1) something that you may question is not necessarily something I may question, and (2) questioning may be a waste of time.
If a paper that says mixing red and blue paint makes green paint has a thousand citations, perhaps you don't need to question it because others already have. If you can't reproduce it, the simplest thing to do is ask an expert who says it is possible to do it.
It's fair to question things, especially if they don't make sense to you and even if acknowledged authorities are behind them. However, (1) something that you may question is not necessarily something I may question, and (2) questioning may be a waste of time.
If a paper that says mixing red and blue paint makes green paint has a thousand citations, perhaps you don't need to question it because others already have. If you can't reproduce it, the simplest thing to do is ask an expert who says it is possible to do it.