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Interesting. Aasimov wrote a short story along the same lines once, about humanity and three other intelligent interstellar species. Humanity was the only one that actually stopped growing at a point in its lifespan, while when that happened in the other three species it was considered a rare and deadly disease. In humanity, the reverse occured - occasionally, there was an occasional disease which caused portions to continue to grow, much like the natural state of the other species - but in humanity, it was called "cancer."

Interesting. I never read that story.

You should. Asimov is a great writer.

I'll try to look up the title of the short story over the weekend.