> SHAPIRO: But just to rule out any other possibilities, is it possible that a person could have brought it into the market and spread it to those animals and to other people there? > DOUCLEFF: Yeah. So these papers addressed that one, too. One of them looks at the genetics of the virus found in the market, and it shows that two different variants jumped into people at almost the exact same time. And it shows that these variants, one of which went on to spread all around the world, couldn't have actually evolved in people. It's astonishing to me that there are people this stupid who hold down a job. TOM: "What's the proof that someone didn't bring the virus from the lab and infect people at the market?" BOB: "Well, Tom. We can tell the virus didn't evolve in humans. Therefore it couldn't have been engineered in the lab and then infected a person from the lab. We know that because such a virus would not show signs of having evolved in humans."