Bigger!

source

How do things get bigger?
How do humans get bigger?
They grow taller, but how?
At what point do they grow big?
How does it add up?
You can be staying with someone and seeing the person in the morning, he is a few inches taller. How?
These are questions I ask myself from time to time, and I am still clueless.
Maybe someone would be nice enough to give me a answer!

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