I remember sitting around a table — about the size of the table in this room — and debating, in particular, about this issue of human embryo editing. Should people do that? Is that something that we should be trying to work towards or work against, or how do we think about that? And a lot of people around the table were talking about all the dangers of doing it and how risky it could be, et cetera, et cetera.  And then, at one point, a colleague of mine leaned across the table and said, “Wait a minute. At some point, this technology may be accurate enough that we’ll all realize that it would be unethical not to use it that way, to correct the disease-causing mutation for cystic fibrosis or Huntington’s disease or things like that.”  And it made everybody stop and think for a minute and just say, “Wow. We could turn this whole question on its head.”