They say that if you hear something often enough, you start to believe it to be true. This has been proven over and over again. Most notably, the social media evolution has given ample evidence. But there is an extension to this. Hear something often enough, you start believing it to be true. Keep hearing it and it stops being true and becomes fact. There is a difference between truth and fact. Truth is subject to interpretation. Fact is not. What the fact means, and how the fact links to other facts, that is open to interpretation. The Fact, however, is not. You can argue what causes us to stick to the earth, but that we stick to the earth is unarguable. Gravity is a fact.