challenging IQ question

got this from clement's blog. seems tat he got the question from johnson. not bad, i think it's quite challenging. i took 2 hours to get it
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You have 12 coins. One of them is "defective", meaning that it weighs differently from the others. How do you tell, using a balance, which coin is defective, and whether it is lighter or heavier than the others, in 3 weighings?
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anyway i watched Initial D yesterday with weiquan hanwei n chunghang. yeah it's not bad, just tat too compressed, so missed out alot of things from the anime. but i feel it's a gd job, pretty original to the anime, except for some parts la, but guess couldnt be helped.

oh and the drifting is sooo cool~ i wan learn too. LoL.