有机食品:天使or魔鬼?

正在中国,有机产品以更安全、更健康、更美味的形象,轻易获得了大众的认同,即便价格贵得离谱(中国有机食品和常规食品的价格差异远高于国外),也依然备受青睐。但学界关于有机食品的争论却从未停止过,有人认为有机产品的抗氧化剂含量更高,有人则指出科学试验并未证实有机食品更安全、健康和营养,所谓‘零污染’只是营销噱头。     

天才右脑,yes or no?

当今社会上,有关右脑开发的宣传铺天盖地,右脑的功用被描述得十分重要,远远胜过左脑。可事实上,这些关于右脑的说法孰真孰假,你对右脑又了解多少呢?传闻1:右脑主导的人和左脑主导的人数相当,可以通过简单的测试测出你是哪个脑主导。NO!我们都知道左脑控制右半边的身体,而右脑控制左半边的身体。世界上大部分人都是习惯使用右手的,也就是右撇子。而左撇子约占总人口数的百分之十。     

Methane: an open or shut case?

The author examines conflicting models, especially evidence from Price and Schoell in this issue (see comment), for the creation of ore deposits and the movement of petroleum. The Bakken formation in North Dakota is used as an example of a petroleum reservoir that has not migrated from its original site. Analysis of natural gases at the site indicates a difference in gas distribution between the Bakken site and migratory sites. Controversies are examined in the context of advances in fluid-flow calculations and high-temperature methanogenic reactions.     

0957 + 561 A, B: twin quasistellar objects or gravitational lens?

0957 + 561 A, B are two QSOs of mag 17 with 5.7 arc s separation at redshift 1.405. Their spectra leave little doubt that they are associated. Difficulties arise in describing them as two distinct objects and the possibility that they are two images of the same object formed by a gravitational lens is discussed.