How is there enough stuff present and left over from the big bang to enable species to continue to reproduce? Genes are so tiny, but they turn into things like elephants and whales, that go on to make more elephants and whales. When does the matter run out? Did we start with a given amount of matter and that's all we've got to work with? If not, how is it that matter continues to be added?
I just always thought that there was a specific amount of stuff in the universe, and we are part of that stuff, but we and all of it just keep making more and more bodies, more people...It seems endless.