1800年代末，在意大利的里雅斯特，一位名叫西格蒙德·弗洛伊德的医科学生受命研究雄性鳗鱼的睾丸。他假设鳗鱼睾丸是体腔内结成的白质环。
In the late 1800s in Trieste, Italy, a medical student named Sigmund Freud was assigned to investigate the testes of the male eel, postulated to be loops of white matter festooning the body cavity.
此类眼镜的原型诞生于上世纪90年代中期，Silver帮助化妆品巨头雅诗蓝黛开发出一种廉价且放大倍数可调的镜子之后。
Silver made his prototype glasses, called AdSpecs, in the mid-90s after helping cosmetics giant Estee Lauder develop an inexpensive mirror with adjustable magnification.
一项调查报告证实了这个假设，报告表明20世纪70年代大量灰尘落到了喜马拉雅山冰川上，而且就在这一时期许多欧洲国家制定了净化空气的法规。
That hypothesis is supported by the observation that soot levels fell during the 1970s, a period when many European countries enacted clean-air regulations.
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