[Peter tries to keep busy during their stay on the island, but he's gotten to the point where he's inventing things to keep him busy. After he does a check of their shelter, he heads down the beach, an excited, little-boy smile spreading over his face when he sees Tony and Bruce on the beach. That smile stays on his face, but his expression becomes one of curiosity when he sees that they're obviously doing something. The smile drops and his brow furrows as he walks barefoot along the top of the equations they've made. By the time he looks up to them, his expression is serious. His eyebrows go up a bit, still curious, but the sober sort instead of the excited sort.]

You're trying to divert heat--biochemical heat to--to somewhere else. Or...just getting it to make something besides heat. Right?

[Oh! OH! He's seen this before. Now that expression goes to excitement and he starts tripping over his words.] You're...I mean this--you could--potentially, I mean--you could--if it worked. If you could make it work in a human body. [Right. Deep breath. Collect your thoughts, Peter. Slow that brain down so that you can say words.]

You're regrowing limbs. Potentially. I mean. Regrowing, not just limbs. Everything. I mean you could. With this--this formula. If you could get it work. Why?