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I got a new laptop for christmas and i am concerned that maybe the keys will get a little loose or break if you type to fast or aggresively?anybody know how fragile they are ?does one year warrenty usually cover these problems?can you fix them easily if you do break one?is it a nice idea to get a can of that air and blow your keyboard with it e week?

I wouldnt worry. keyboards are pretty tough and can handle some abuse.