感冒，沒鍛煉

大惑易性。小人則以身殉利，士則以身殉名，大夫則以身殉家，圣人則以身殉天下。

So why is it so hard to payattention? Well, studies show that even when we're really trying topay attention to something -- like maybe this talk -- at somepoint, about half of us will drift off into a daydream, or have thisurge to check our Twitter feed.