and compare.

One of the things I feared was that we wouldn't find comparable sites because maybe the high-income people had gone continuous.

We did not find that to be the case.

So now why does it take 18 months? Why did the study take so long? Part of the reason the study takes so long is because water quality varies seasonally.

So you have to be there for average seasons, and then you have to be there for the worst possible seasons, which are typically in the immediate aftermath of the monsoons.

Child diarrhea, the same way, is seasonal.

There are usually two peaks in the year, so you want to be there long enough to catch both the peaks, right? Those were the main reasons.

And what did we find? We found that child health