I'm new to mac and just bought the aluminum macbook 2.4 ghz, 13 in screen. I downloaded iStat and it sometimes the temp. of my macbook gets up to 160 degrees F, even when just surfing the internet for a while. It's sitting on a desk and nothing is blocking the vents. It doesn't feel that hot, but this can not be healthy for the CPU. Is this normal for the macbooks?