Every time I open skype I see that it uses up to 50% of my CPU on activity montior and kernel_task always operates with it side by side using 20-30% of CPU as well. This causes the temperature to go up to 70 C and my fan to go around 4000 rpm. I would just like to make sure this is not harming my Mac and if this is normal behaviour. Thank You Guys in advance PS. Running OSX 10.8.2 on Mid 2010 Macbook Pro.