There are a lot of conversations about PFAS, for obvious reasons, but as well, I think, Professor Wang, you talked about mercury, microplastics and the oil spills. We've heard about TCE, about hydrocarbons.
Can you talk about how we are determining those longer-term impacts as we see them, especially as we talk about the legacy impacts, but also maybe the non-regulated and those longer-term health impacts? How are we measuring that? How are we looking at that? Do we have enough resources?