That's the power of the social network, which, the authors argue, may impact our emotional state even more than our individual choices and environments. And it is not merely a result of like seeking like. The authors compared their observed network with a control network in which they randomly assigned feelings of happiness to individuals, and were able to rule out the possibility that happy people were simply clustering together by choice. Indeed, in another study in the same issue of the BMJ, researchers from Yale University and the Federal Reserve of Boston showed a similar tendency to cluster among people who, for example, are the same height, or suffer from acne, or headaches. But once the researchers adjusted for confounding factors, the network dissolved; in Christakis and Fowler's paper, the happiness link remained unbroken.
基于1个网页-相关网页
frequent or severe headaches 经常性或严重的头痛
However, although eyestrain may cause some pain or headaches, it does not permanently damage eyesight.
然而，尽管眼疲劳可能会引起一些部位的疼痛或头痛，但它不会永久性地损害视力。
Frequent complaints about physical symptoms, such as stomachaches or headaches.
不断地抱怨有病，比如胃痛或头痛。
Present in some prescription glasses, it has the effect of bending light and can cause double vision or headaches in some wearers.
研究者发现，这些廉价墨镜在透光性上做得十分低劣，因光线透过劣质镜片而光线发生折射，容易造成视觉重影、甚至还有头疼眩晕的迹象。
Some develop encephalitis, a brain disease that can lead to headaches, coma or seizures.
VOA: special.2010.07.12
But many experts today are working toward cures or major help for chronic headaches.
VOA: special.2010.03.30
Such medicines may produce headaches or cause them to worsen, the Clinic says.
VOA: special.2010.03.30
应用推荐