Well a fact is something thats true, so no. However textbooks can and do claim things as facts when they aren't, usually this happens when a study is poorly done, or a person lies, or a subject is poorly documented or can't be documented, or there is some sort of general misconception about something that leads to a wrong conclusion.
The highest amount of incorrect statements are usually found in civil history books, like those about countries, states, cities, towns, politics, wars, etc. Medical books also tend to have a lot of nonsense in them because creators of medical products expect to move into product sales faster than research can keep up, and often negative research results are ignored or played down in order to recoup profit loss.
Another example would be new discoveries revealing more information that debunks an older assumption, though if done properly science should not portray or rely on assumptions for anything other than picking what experiment to try and prove or disprove.
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Of course, especially nowadays, with academia more troublesome than ever in their regressive left indoctrination programs. That's just one example, however.
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Depends how old the textbook is.
But usually not.Facts are facts, opinions are opinions. Sadly, people confuse the two.
A fact means it is objectively true. So if one set of data disproved the other it wouldn't be a fact.
some are some aren't
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