He says knowing how to do this may be especially valuable if fossil fuel should become unavailable.

VOA: special.2009.04.14

Now some of you may be wondering, and you'll find out this for yourself about how important it is to come to class.

你们现在可能会想,而且你们将会发现,亲自来上课有多重要

耶鲁公开课 - 关于食物的心理学、生物学和政治学课程节选