these people tend to get very obsessive with certain subject

that is why they can get really good in particular area.

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I would not use the word"obsessive" rather use highly focused in -Bambooseven- 给 Bambooseven 发送悄悄话 Bambooseven 的博客首页 (233 bytes) () 04/27/2011 postreply 13:40:10

after seeing the list you provided, -howcan^- 给 howcan^ 发送悄悄话 (53 bytes) () 04/27/2011 postreply 14:41:13

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