During a festival, what does "double growth rate for a year" imply?
In Kittens Game, the hover text (using "Theme by Kida") for festivals looks like the following:
Hold a cultural festival to make your kittens happy. (+30% to happiness and double growth rate for a year)
The wiki page doesn't explain what "double growth rate for a year" means, and it's not clear what exactly can "grow" (it's certainly not kittens).
Question: During a festival, what does "double growth rate for a year" imply?
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Find the Doubling Time of Exponential Growth
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Images: Ivan Babydov, Matthias Groeneveld, Artem Beliaikin, Matthias Groeneveld