It took 3 billion years from then beginning of life to the appearance of first animals (with the inventions of eukaryotes and then multicellular life as importa

It took 3 billion years from then beginning of life to the appearance of first animals (with the inventions of eukaryotes and then multicellular life as important milestones along the way). Then it took ca. 500 million years to Homo, and 5 million years for our species to develop technology. So I'd say the road from microbial life to cavemen was 1000x larger barrier, then the road from cavemen to technology. Also the barrier from microbial life to first animals (let's assume some kind of worms) was 10x larger than the barrier from worms to technology. In summary, getting early microbial life to get organized into some kind of macroscopic animals, this is the hard part. When that is done, vertebrates, dinosaurs, hominids and internet will follow at 5–10x faster pace. http://en.wikipedia.org/wiki/Evolutionary_history_of_life http://en.wikipedia.org/wiki/Evolutionary_history_of_life