Its not possible. For example. One man say that the water starts freeze at -5 and another one say its 0 of course only one is right. Another example at the Ignaz Semmelweis figure out that the infections and cause of death was not washing hands properly by doctors - they laugh of him. Today we know that he was right and its a standard to keep hands perfectly clean before surgery. Someone think that he/she is right someone is for real and thats a point.