 Well, they look very happy, but the point is to do serious science, the measuring of their growth and the quality of the crop, which is Shirley's domain. Starting this week, we're measuring photosynthetic rate for all of them. How do you do that? There's equipment, it's called LiCo 6800. You just punch the leaves and then it gives you the whole data of stomatal conductance, transpiration rate, photosynthetic rate. So you're actually going to get complete measurements of all this sort of biochemistry?