From the back seat on the way to school this morning:
Mbot: “Mom, why aren’t there any humans on other planets?”
Me: “Well, because the Earth is the only planet that we know of that has the right environment for humans.”
Gbot: “Because the Earth is not too big, and it’s not too small. And it has all the continents. Pluto does not have any continents. And so all the people would get squashed together if they tried to go to restaurants, or shopping, or school.”
Mbot: “Oh, you can’t plant any seeds on Pluto.”
Gbot: “Even there are no cats.”
These answers satisfied us all, and off the bots went to school, to learn even more.