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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.

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Americans are constantly connected and staring at digital screens—be they cellphones, tablets, computers or TVs. Many times, multiple devices are being used at once. This constant exposure is taking a toll: more than half of Americans report feeling digital eyestrain—discomfort caused from the use of digital devices. When more than one device is used 75 percent report discomfort.

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Here’s another reason to consider giving your cellphone a rest: Compulsively checking such devices as a way to cope with uncomfortable situations has been linked to anxiety and depression in college-age students.

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(Credit traska / Flickr)

“People need to think of adequate sleep as an important aspect of maintaining good health," said Erin Hanlon, Ph.D., lead author of a new University of Chicago study linking insufficient sleep with increased consumption of snacks and high-energy, high-fat foods.

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The city on Monday morning confirmed the first case of Zika virus. The patient, who was identified as a woman in her 30s, visited Presence Saint Joseph Hospital after returning from a trip to Columbia with symptoms consistent with the virus.

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The state of Illinois doesn’t track the number of pharmacies that mix, combine or alter the ingredients of a drug or require those that perform sterile compounding to report serious adverse events, according to a new report by Pew Charitable Trusts.

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There's a new way to measure age that might prove helpful in assessing an individual's risk of developing cancer, according to a recent Northwestern University study. Learn about epigenetic age and how it can impact your health.

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(RelaxingMusic / Flickr)

Why Loyola Medical students are being encouraged to learn Transcendental Meditation – and how it could make them better doctors.

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New discoveries and treatments are transforming the way doctors are fighting cancer. We speak with two specialists about recent developments that may offer hope for many patients.

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Opioid and heroin overdose deaths hit record levels in 2014, according to the Center for Disease Control and Prevention. The alarming rise in heroin deaths has tripled since 2010. "Chicago Tonight" talks about the heroin crisis with the executive director of a treatment facility and the founder of an anti-heroin education and advocacy foundation.

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It sounds simple: slow down and make better choices. Most of us don't do that as well as we could, but researchers are studying how the simple act of slowing down can reduce crime. Brandis Friedman has the story.

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The disaster in Flint has spotlighted the dangers and adverse health outcomes of lead seeping into communities’ drinking water. Elizabeth Brackett reports on the lead pipes carrying water into Chicago and suburban homes. 

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It's the weekend for love, but Valentine's Day can leave some feeling awfully lonely. A University of Chicago neuroscientist joins “Chicago Tonight” to discuss the science of loneliness and its potential health hazards.   

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A marathon last month in Antarctica was the first of seven on seven continents ... in seven days. Two of the competitors are back in Chicago to tell the story–including the winner.    

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According to the Centers for Disease Control, an estimated one in 68 American children has Autism Spectrum Disorder. A new book tells the story of some of those parents as it takes a look back at autism’s dark history of institutionalization, questionable therapies and plain bad science. 

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(Aedes albopictus)

On Monday, the World Health Organization declared the Zika virus an international public health emergency. Dr. Allison Arwady, chief medical officer of the Chicago Department of Public Health, joins us to discuss the virus and the risk it poses to Chicago jet-setters.