 You're making the choice. You're asking a child to participate in something and you know that half of them, half of those children aren't going to be getting a vaccine. It just feels different. You're actually doing a trial where you know there are children who may die and be paralyzed and that other half because they haven't gotten a vaccine. And the truth be told, that's the only way you're going to know that. And Paul told us that this is actually what's happening with COVID now.