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and also have justinbieberaphobia (ITS SCARY!!!)
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Geewhizz, I bet.
Mass cannot be destroyed or created, as far as we know, only conversed to energy, and energy thus turned to matter.
In a way they're infinte in nature, but only according to how much is within the universe, what is in the universe, always has and always will be in some form or another (as far as we know).
(Others, feel free to prove me wrong, perhaps I got something mixed up there)