Conservation of Energy

Wanna go to the market with me? We need a few things.
Nah, I'm working on a new experiment, and I may be close to a breakthrough.
What experiment? You've been lying on the damn couch all day!
That's the point. It's all about conservation of energy. A very important principle these days.
What about me? I'd like to conserve some energy.
Sorry, you're not part of the algorithm.
Next experiment then?
Sure. Get me some ice cream while you're out.