Rolf nodded. "Yeah, those long-term things can be hard to pin down, especially when every year the weather can be different and affect such things," he said. "I've not been a part of very long-term studies as of yet, really, except for the one when I was small and we stayed in one place for... two years or so?" he mused aloud. "I can imagine it was controversial to start, though, contradicting a lot of what we thought we knew like that."
Rolf was just as enthusiastic as Charlie about talking shop. He had similar things that he often could talk about for who knew how long.