Why?

The kids have been very interested in the amount of gas the body can produce each day. I think that is all they talk about in the car, home, school... The other morning I came down to breakfast and heard: 'Megan what are you up to?' (said by Ben), Megan replied '4'. They give updates in the car on the way to school, after school, and before bed. It seems the goal is to hit 100 for the day- without going over. Don't know why the sudden fascination with gas all of a sudden. Why can't they be interested in how many toys they can pick up off the floor? Maybe I should create a contest involving that.