<p>Notice their head getting warm after doing a lot of thinking?</p>
<p>Maybe I need a cpu fan for the head… :o</p>
<p>yep! I do felt like that, in fact, I do feel like that frequently, esp on a day when I had no sleep at all last night (oh well, procrastination as usual!)! actually, the back side of my head only feels like that…anyway, that’s probably the concern of a doctor!</p>