More than 6,500 athletes compete this weekend

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2014 ITU World Triathlon Chicago (Delly Carr / ITU Media)

Chicago lost out on the Olympics to Rio but this week, world titles will be at stake as 6,500 pro- and age-group triathletes compete in the ITU World Triathlon Grand Final and World Championships. Chicago Tonight's Elizabeth Brackett will be one of them – she tells us what to expect.

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The Mackinac Bridge.

A break in the aging pipeline that crosses under the pristine waters of the Straits of Mackinac could be catastrophic for the Great Lakes. Is the old pipeline a threat? Elizabeth Brackett brought us the story in June. We take another look in this encore presentation.

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Started by a mother’s desire to help other families with children with Down syndrome, Gigi’s Playhouse now has locations in 23 states in the U.S. and Mexico. Elizabeth Brackett reports on how the organization has helped its namesake and many other children.

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The Great Lakes contain 90 percent of the fresh water in the U.S. and the Straits of Mackinac have some of the most pristine water in the Great Lakes. But underneath the water are more than 60-year-old pipelines carrying crude oil and natural gas. Elizabeth Brackett has the details.

Chicago Tonight Participates in Chicago Community Trust Initiative

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As part of the Chicago Community Trust’s On The Table, Chicago Tonight correspondents Eddie Arruza, Elizabeth Brackett, and Brandis Friedman hosted dinners with area residents on Tuesday. We hear from them and the dinner guests about the conversations they shared.

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Community residents liked what they heard about plans to improve the lakefront along the Morgan Shoal on the city’s south side.

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The Army Corps of Engineers moves ahead on its plan to control Asian carp and other invasive species.

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KCBX reduces its petcoke piles by half and says new air monitors show that petcoke dust does not leave its facility. But the EPA cites the company for two violations of national air quality standards.

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The first phase of the new wilderness park on Northerly Island should be open next spring. We take a look at the transformation of Northerly Island over the last year and a half.

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Illinois communities call for tougher regulations on the increasing numbers of railroad tanker cars filled with volatile crude oil rolling through their communities. Elizabeth Brackett has the story.

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This summer a toxic algae bloom in Lake Erie led to 500,000 people being cut off from their drinking water in Toledo. Elizabeth Brackett details the latest efforts to protect the Great Lakes drinking water.

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A summit to discuss the protection and preservation of the Great Lakes meets in Chicago. The meeting comes in the wake of last month’s water crisis in Toledo. Elizabeth Brackett has the latest.

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We see how the city is taking care of Ash trees hit by the Emerald Ash borer.

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It will be a hot issue in the upcoming mayoral campaign—an elected school board. Chicago Students Union will march in favor of an elected board in a rally. We discuss the growing debate on Chicago Tonight.

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The Common Core State Standards set expectations for what children should know and learn. Originally adopted by 47 states including Illinois, major pushback against the standards has now developed.

Chicago Named A Host City For The ITU World Triathlon Series

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Chicago is the only U.S. stop on the eight city worldwide triathlon circuit this weekend.