Hear what viewers had to say about our talk with CTU president Karen Lewis and our web story on a new water treatment plant that uses ultraviolet light to help clean the Chicago River when we read feedback from the "Chicago Tonight" website, and our Facebook and Twitter pages.

How will rank-and-file police officers react to the mayor's unexpected appointment of CPD veteran Eddie Johnson? Two former Chicago Police officers share their perspectives on Emanuel's pick and to aldermen inserting themselves more into the selection process.

In the Loop, a photographic feast is now being served. To celebrate its 40th anniversary, the Museum of Contemporary Photography combed its archives to find the pictures that best reflect the character of the museum. What they found were dramatic images from the 19th century to the 21st.

Chicago Teachers Union President Karen Lewis said the newly approved April 1 walkout is not about contract negotiations with CPS. “If it were a contract strike, it would be illegal,” Lewis said to Eddie Arruza. “This is an unfair labor practice strike.”

Meet the local man who's a certified Lego professional with a brand new exhibit at the Museum of Science and Industry.

Last week's primary election saw several firsts, including same-day voter registration and record-breaking early voting. Cook County Clerk David Orr discusses what it means for the future.

The Illinois Supreme Court dealt Mayor Rahm Emanuel a major setback Thursday in his efforts of saving two of the city’s four public employee pension funds, which city officials say could go broke within the next 15 years.

A new book by Natalie Moore about the South Side blends personal history with investigative reporting to tell the story of a segregated city and misunderstood neighborhoods.

Activists want a date when the 88-year-old Waukegan coal-fired power plant will begin a transition to cleaner power. But NRG Energy says it's poured millions into pollution controls for the plant and has no plans to close.

President Barack Obama addressed the Cuban people early Tuesday during his historic trip, saying, “I have come here to bury the last remnant of the Cold War.”

In 1958 a Navy sailor from Chicago was briefly onshore in Cuba while the revolution was underway. The sailor, named George Klauba, became first a tattoo artist and then a painter. For years now, he has focused his artistic energy on remembering a moment in history and putting his dreamlike impressions on canvas.

Efforts to derail Donald Trump's momentum heat up within the GOP as voters in Arizona and Utah decide who to support in Tuesday's primaries.

Rising rates of addiction to heroin and prescription drugs have been making headlines across the country. Find out what the latest science is telling us about the nature of addiction.