费用：大约50美元，用于买一些有用的书。

Cost: $50 or so for some helpful books.

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接着，我们便在欢笑中继续我们的“寻宝行动”，因为我们只带了五美元，因而只能对每一美元精打细算，以期找到书架上那本最古旧，价钱最少的书。

We joked as we continued our treasure hunt, clutching our spending money of five dollars apiece, all hoping to be the first to find the oldest, least expensive book. It was a bittersweet excursion.

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维利·奥威斯吉特的新书，《脸谱世界文学史》（热书（译者注：销售商名称）14.99美元）一本假正经地回答了此类的问题。

Wylie Overstreet's new book, "The History of the World According to Facebook," (It Books, $14.99) answers some of these questions, with its tongue firmly in its virtual cheek.

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