They're still an accumulation of eruptive behavior of a single volcano over time. It could be up to two weeks, based on what we know of recent eruptions.

I don't know if they're seeing it on the ground or in the air.

The plume direction is going to vary with altitude.

We're showing for the first time that incidental emotions from one situation can exert a causal effect on economic behavior in other, ostensibly unrelated situations.

The assumption, I guess, that propels this is that once you randomly test students, they'll just stop experimenting. But behavior is really complex. It doesn't always work that simply.

It's up to them to use the time to by helping structure a family's mealtime practices, modeling behavior, and coaching children.