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We meet local scientist and entrepreneur Adam Khan to talk about his latest invention that he hopes will usher in a new diamond age of electronics that will make the silicon chip obsolete. Watch web extra videos.

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The polar vortex made its unwelcome return today, causing delays and closings. Will tomorrow be a repeat? Paris Schutz has the story. Send us your severe weather photos here and we'll use them in our online slideshow.

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WGN's Chief Meteorologist Tom Skilling talks about the city’s record low temperatures, and what we can expect over the next few days.

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We are joined by author Peter W. Singer to talk cybersecurity, his new book and what you need to know to protect yourself online. Read an excerpt.

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To mark the 157th anniversary of Chicago's first science museum, we take a look at some surprising specimens - including a Chicago rattlesnake.

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Scientists at west suburban Fermilab have installed the final piece on a massive particle detector called NOvA that may answer some very big questions. We go deep underground to uncover how the contraption might do that. Read an article.
 

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We take a tour of the MINOS underground facility and watch the installation of the last NOvA Far Detector module. Read a behind-the-scenes blog and view a slideshow.

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Deep freeze lifts a little as the Chicago area continues to cope with the cold weather. Elizabeth Brackett has the details. Send us your severe weather photos here.

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The extreme weather caused Chicago Tonight producer Josclynn Brandon to get stuck in Lafayette, Indiana on her way back to Chicago from a wedding in Louisville. Read a blog about her experience, watch a web extra video, and view a slideshow.

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Today's record cold caused delays on the Metra and CTA. We tell you how the city is coping. Send us your severe weather photos here and we'll use them in our online slideshow.

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We have the latest details on Chicago's record-breaking cold weather from WGN's Chief Meteorologist Tom Skilling.

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A major federal report was released Monday giving options for dealing with Asian carp, ranging from maintaining status quo to installing a permanent barrier to separate the Great Lakes from the Mississippi River Basin. Elizabeth Brackett has the story. Read the full report.

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The new year kicks off with snow blanketing the Chicago area, creating a messy commute for drivers and airport cancellations. We have the latest details from WGN's Chief Meteorologist Tom SkillingSubmit your snow photos here and we will use them in our online slideshow!

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Science catches up with science fiction as we revisit a conversation with Professor John Rogers, the inventor of epidermal electronics -- tiny, bendy computer chips that can be placed on or in the human body to monitor critical health data. Watch web extra videos.

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Gov. Pat Quinn joins famed Apollo 8 astronaut Jim Lovell to celebrate a very special anniversary. Paris Schutz has the story. Watch a web extra conversation with Lovell from our archives.

Dinosaur Discovery

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On this edition of Chicago Tonight’s Field Trip, we take a look at the dinosaur that was king before the T-Rex. Watch the web episode and view a slideshow.