Almost every sf story that involves cloning includes the notion that clone bodies can be grown at an accelerated rate. It's a mighty convenient genre convention: it lets the author provide clones of the same age as the cloned characters. But I've never heard of any scientific basis for the idea that you could grow a human body any faster than nature does.
Anyone know if there's any real science behind this? I'm willing to write it off as a genre convention, but I'd be happier with it if it's actually plausible.