Hi guys. I hope Scientists are at the same time civilized. Because science is civilization. Firstly I'm sorry about language. In Turkey, Our education system does not adequately support English. Anyway. What is the evidence about gravity is exist. Wait. I mean, we know something pushing everything down or pulling everything down, we know it. But why do we think that something is a force and why it should be gravity? Do you have a scientific explanation before you are far from science? Or do you just believe that? Thank you in advance.