OK, Daddy, guess what? Here’s my idea. We get a stick of wood and we put a timer on it, then we get a big rock and put it on the end. We have to put feet on the big rock, so it can stand on the stick.
Then when the rain comes down, down, down, we push really hard on the stick. We have to do a really big push, then the rock will go up in the air and come down, and the mountain will grow. Then we measure how much weight it took, and how much damage it did when it hit the ground. With the timer. Which isn’t a timer, it’s a scale.
That’s what we’re going to do tomorrow!
(It’s not perfectly verbatim, but that’s pretty close to what she said when she came over with this drawing. At four-and-a-half, she’s well on her way to being a mad scientist…)