text: All of these risks that I have listed are all for what reward. A car that can drive itself does not have the human capablitiy to keep is passengers safe. All of what I have said is to prevent the lose of a life or even just a law suit. I feel that all my concers raise some major red flags that should be covered before the risk of a life or someone's property. My name is Bob Greene. I am a scientist at Nasa and I am explaining the "Face of Mars" to a man who thinks that this is a sign of an alien artifact. The man continues to argue with me and say that aliens are real and this alien artifact looks like a human face. I have to keep telling him that this is just a natural landform which is called a butte or mesa. This certain mesa looks like a face only because it shows most of the characteristics that a human has such as; the illusion of eyes, a nose, and a mouth which are all just formed by shadows. The man asked how does NASA know that this rock formation that you "supposedly" think, is a mesa? He just thinks that it's a sign of aliens. I tell him that Nasa was able to figure it out because a mesa is a a big rock formation that just has a flat top and thats what the face looked like if you see it up close. He still did not believe me. I told him we will find out and we did.