这封信是达尔文为感谢美国地质学家费迪南德·范德维耶·海登博士而写的。
The letter was written by Darwin to thank an American geologist, Dr. Ferdinand Vandeveer Hayden.
诺维信股票减少今年早期的损失，是在杜邦公司，美国第三大化学公司，声称计划将和丹尼·斯克一起建立一个试验工厂，用来制造第二代生物燃料之后。
Novozymes stock pared its loss earlier this year after DuPont co., the third-largest U.S. chemical company, said it planned to build a pilot plant with Danisco to make second - generation biofuel.
《科学美国人》刊发了这封信，并附带了物理学家弗兰克维尔泽克深思熟虑的一封回信。
Sci Am printed the letter with a considered response from physicist Frank Wilczek.
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