The lack of effort required probably accounts for why TV watching takes up more than half of Americans' free time, the study said.

由于缺乏必要的努力可能是美国人半熟时间都为电视所占有的原因，该调查报告说。

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In the new study published in PLoS Biology, worms that made more free radicals or that were treated with a free-radical-producing herbicide actually lived longer than normal worms.

这项新的研究发表在《公共科学图书馆·生物学》上，在该研究中，产生更多自由基的蠕虫或者服用了促进产生自由基的除草剂的蠕虫竟然比普通蠕虫的寿命长。

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The study of 2, 000 older internet users by researcher Mintel found that more than a third of men and women over 55 also visited sites like YouTube to watch videos for free.

英国明特尔市场调查公司在对2000名“银发网友”进行研究后发现，超过三分之一的55岁以上网友还访问YouTube等网站免费观看视频。

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The new Australian study found, however, that using hands-free kits can reduce the effects of electromagnetic radiation by more than 90%.

BBC: Hands-free mobiles given safety boost

But the authors of this study say there is growing evidence that more people are insisting on smoke-free homes.

BBC: Childhood asthma 'admissions down' after smoking ban