Fact
A fact is a statistic, datum, or event that is objective, observable, and recordable.
Facts are used as evidence to make claims. Facts are generally held to be mind-independent, i.e. they would continue to be the case whether or not anyone believed them, or indeed whether or not there were any minds to believe them in the first place.
Facts are different from theories, which attempt to explain trends in facts. Facts are also different from opinions, which are subjective interpretations of facts.
In history and journalism, "facts" refer to recorded, independently-verifiable events or statistics. In science, "facts" are observations or data, (fact: at sea-level, water boils at 100 degrees Celcius, while other liquids boil at different temperatures) and theories are built to explain facts (theory: why water boils at 100 C, why different liquids have different boiling points).