Human intelligence can decide for the future. The animal cannot decide. We have discriminatory power. If I do this, I will be benefited; if I do that, I will not be benefited. This is there in human life. So you have to use it properly: Revision history
Diff selection: Mark the radio buttons of the revisions to compare and hit enter or the button at the bottom.
Legend: (cur) = difference with latest revision, (prev) = difference with preceding revision, m = minor edit.