Anesthesiologists that have examined xenon clinically, they've concluded that it has a number of attributes that make it, essentially, the perfect anesthetic. It is not metabolized in any way. It can be recycled indefinitely. It's extremely potent—more potent than nitrous oxide. When it's given to a patient, they recover, very, very rapidly after the xenon gas is removed within seconds ... It has no known toxicity. So, it is, arguably, the perfect anesthetic and maybe even the perfect drug. It's incredibly incredibly euphoric.