In the same way, one day, when someone will discover life on other planets or something similar, there will be people telling us, that people knew that life exi

In the same way, one day, when someone will discover life on other planets or something similar, there will be people telling us, that people knew that life exists outside of the Earth. Evidence is one crucial point that is necessary to be able to distinguish tattle from facts. Knowledge without evidence is just a possibility. An in my very amateur opinion, Mr. Snowden receives the personal credit simply because he has provided the world with evidence of that previously "known" activity.