A fact is an occurrence in the real world. The usual test for a statement of fact is verifiability—that is whether it can be demonstrated to correspond to experience. Standard reference works are often used to check facts. Scientific facts are verified by repeatable careful observation or measurement by experiments or other means.
side – noun
1: a position that is opposite to or contrasted with another
two sides to every question
2: a line of descent traced through one’s parent
grandfather on his mother’s side
3: an aspect or part of something contrasted with some other real or implied aspect or part
the better side of his nature