But wait a minute， I’ve seen pictures of asteroids that have all sorts of crazy shapes.Why aren’t they round？Only because they aren’t big enough for gravity to be a determining factor. If an asteroid were to suddenly become as big as a moon， it would indeed rearrange itself gradually into a sphere.
　　Our pupils， the black holes which let light into the eyes， don’t just help us see， they also signal what’s going on in our minds. Here are 3 pieces of psychological research which show how changes in pupil size reveal many aspects of thought.
　　1. I’m thinking hard
　　Research has shown that the harder your brain works， the more your pupils dilate.
　　2. My brain is overloaded
　　Research has reported that when participants’ minds were loaded to 125% of their capacity， their pupils constricted.
　　3. You’re holding my interest
　　People likely to be interested in anything new， so their pupils will dilate a bit at first， but they’ll only stay dilated if they continue to be interested.
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　　改变坏习惯
　　允许自己被坏习惯控制是破坏性行为。一些人可能习惯说话粗鲁，一些人习惯对别人的意见充耳不闻，还有一些人习惯拖沓。如果任由这些坏习惯发展，它们会失去控制，变成生活或事业上的巨大障碍。
　　许多成功人士因改变不想要的习惯而受益。比如，杰克·韦尔奇小时候有严重的结巴，成为笑柄。在妈妈的鼓励下，他客服看了结巴，变成了商业圈的传奇。
　　坏习惯很可能让我们无法实现志向。因此，我们应该警惕自己的坏习惯并不断努力去改正它们。