The subject matter of teaching is beginning with this understanding, that life is different from matter. That is the beginning, ABCD. So if your basic knowledge is wrong, then what is the use of going further? It is all false knowledge: 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.