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Sears Tower's Cables

The Sears Tower contains 25,000 miles of electrical cable and 43,000 miles of telephone cable.

May 1 at 8:23 PM 3.3 4

The Harrison Dever Crib

Much of Chicago's water is pumped through a 20ft diameter tunnel from the "two mile crib", two miles offshore, to a filtration facility near Navy Pier.

April 26 at 10:01 PM

Adler Planetarium: America's First Planetarium

The Adler Planitarium was the first planetarium in America, founded in 1930 by Chicago businessman Max Adler.

April 17 at 8:36 PM 3.8 4

A Man-made Lakefront

The wood pilings, concrete steps, and huge rocks along the lake shore are different solutions to the same problem: how to keep the land from eroding into the lake.

April 11 at 2:12 PM 3.8 4

Wrigley's Air Conditioning

The first building in Chicago to offer air conditioning was the Wrigley Building, in 1921.

April 4 at 8:21 PM 3.0 4

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