Now by the way, if you look at this on a linear graph, it looks like everything has just happened, but some observer says, "" Well, Kurzweil just put points on this graph that fall on that straight line. "" So, I took 15 different lists from key thinkers, like the Encyclopedia Britannica, the Museum of Natural History, Carl Sagan's Cosmic Calendar on the same — and these people were not trying to make my point; these were just lists in reference works, and I think that's what they thought the key events were in biological evolution and technological evolution.