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Children grow very quickly in the first few years of life. 
And then,
eventually, that growth slows down.
New businesses
(and new shows) . . . are the same.
It's easy to
get them to grow during the first few years (or months if you're talking about
a show). The hard part is to continue that growth, long after puberty is
over.
Because
otherwise, they just get old and die.
