So I had a discussion with my childhood rabbi a week ago (I am atheist but he is cool) because I wanted to know if the Earth was flooded, and Noah could only bring his family, how did we get all the other people after the flood, with the exception of incest being the obvious. He said that other people have asked that question, and his theory is that after the flood Noah and his family climbed this big hill and saw other people on the other side of it and thus made other people. I also asked about all the animals and why didn't they eat each other and how did they get all that food into the Ark to survive that long. He said he did not know. This was a very interesting conversation, a rabbi not knowing obvious answers to obvious questions.