"Observable facts" are things that can be seen or proven through direct evidence or data. They are real, tangible pieces of information that can be observed and measured. Full definition
However, his reformulation of relativity was not accepted by physicists, no doubt because he was never able to show any confirmable difference between the predictions of observable fact derived from his theory and that of Einstein. (religion-online.org)
The theory of evolution by natural selection is a beautiful explanation for the diversity of life based on observable facts. (religion.blogs.cnn.com)
If you have some patience and an open mind, you may get an answer one day that's based in observable fact and reasonable interpretation, rather than one that's based in 2000 year old mysticism. (religion.blogs.cnn.com)