Hi. I have a question. We are all excited about wealthy entrepreneurs and companies who are working hard to bring about one more components of new space capabilities and technologies. Suppose I were a billionaire and I wanted my contribution to be nuclear thermal propulsion. What would it cost? What would the regulatory hurdles be? Is it accurate to say that our government would just prefer that no one does this, or is it simple a matter of money and a willingness to work within the regulatory framework? I know that an expensive test facility would have to be constructed and open air testing would probably never be possible, but I'd just like to get a sense of whether this could ever be something an entrepreneur could realistically do or if it must forever remain the exclusive domain of the government.