That's a pretty low bar, both of those are massive health crises, that we may not fully understand the extent of yet. Moreover, it took us a really really long

That's a pretty low bar, both of those are massive health crises, that we may not fully understand the extent of yet. Moreover, it took us a really really long time to realize how dangerous they were- so they are a good example that extremely dangerous things can still take a long time to isolate... especially when the exposure is fairly widespread and we can't isolate/control to study it.