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I`m a multitasker. Sometimes, I overexert my little Macbook. It doesn`t explode or anything, but it heats up quite a bit. When you use it normally, there`s no problem with the heating up. But when you do a million things at once like I do, and download big programs and movies and songs 24/7. This laptop fan, not sure where I got it because I stole it from my dad`s office ;) but it works really well! Whenever I download something or hear the fan in my laptop and it gets really loud, I plug the usb into my laptop and turn the fan on. It`s powered by the laptop and you just set your laptop on top of it and it cools it down :)