The Guinness World Record: The latest record of the largest pillow fight was set on October 27,2013 in Chicago, with 4,500 pillows and 3,813 people.

吉尼斯世界纪录：规模最大的枕头大战最新纪录于2013年10月27日在芝加哥创下，共有4500个枕头和3813人参与。

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Microsoft’s data centres in Chicago and across the world are equipped with software that tells him exactly how much power each application consumes and how much carbon it emits.

微软这个数据中心和世界上别的数据中心一样都配备了软件可以显示每一个应用消耗多少电能、产生多少碳排放。

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Today, Chicago has the largest Confucius Institute in the world, which Hu will visit this week.

胡哥这周将访问在芝加哥的世界上最大的孔子学院。

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The CME Group, operator of the Chicago Mercantile Exchange, is one of the world's largest traders of derivatives.

VOA: special.2011.02.18

Chicago was called Hog Butcher for the World because of its huge meat-processing industry.

VOA: special.2010.01.10

Chicago O'Hare is one of the world's busiest airports.

VOA: special.2009.01.12

In 1893 Hershey visited the Chicago World's Fair, where he saw an exhibit of German chocolate-making equipment.

FORBES: Magazine Article

It later makes a splash at the 1893 Chicago World's Fair.

CNN: Cleaning through the ages

Specifically, he had top billing at the Wizard World Chicago Comic Convention 2010.

FORBES: Magazine Article