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Four specially-designed suction cups are used to attach a bio-logging device to the backs of bottlenose dolphins at Brookfield Zoo. (Alex Ruppenthal / Chicago Tonight)

Brookfield Zoo is leading a first-of-its-kind study to collect data from dolphins and other aquatic mammals using a Fitbit-like device that figures to revolutionize human understanding of the animals’ behavior.

Are chronic pain patients losing access to opioids? One advocacy group says yes, and now it’s pushing for “more reasonable” guidelines from the CDC on opioid prescriptions.

Gov. Bruce Rauner used his veto pen this week to rewrite a bill making minor technical changes to the state’s new and much-debated school funding formula. State Superintendent of Education Tony Smith joins us.

The commercials for do-it-yourself DNA testing kits promise a bounty of self-discovery about your history and health. But are you prepared for the results?

The author, actor and former “Saturday Night Live” cast member tells us about her new stand-up residency at The Second City.

He has seemingly been part of the Chicago political scene forever, first as an activist but then as an alderman, political science professor and twice as an unsuccessful candidate for Congress. Dick Simpson talks about his new book.

El Lissitzky. “Beat the Whites with the Red Wedge,” 1920. Ne boltai! Collection.

An exhibit at the Art Institute of Chicago features the artistic outpouring of Russian artists after the October Revolution of 1917, the coup that brought the Soviet Union into being more than a century ago.

(Alvaro del Campo / The Field Museum)

A team led by Field Museum conservation ecologist Corine Vriesendorp has worked for 15 years to protect one of the most biodiverse places on Earth. This week, it was designated as a national park.

The Illinois primary is March 20, but you don’t have to wait until then to cast your ballot.

Watch the Jan. 11, 2018 full episode of "Chicago Tonight."