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Just back from Nepal yesterday, we speak with a local doctor who was in Nepal providing knee and hip replacements. We get the latest from her on the unfolding humanitarian crisis.

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As awareness increases about the risk of traumatic brain injury while playing contact sports and the possible long-term health impacts, we talk to Dorothy Kozlowski, a professor of biological sciences at DePaul University whose research focuses on understanding and treating the injured brain.

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Chicago Tonight staff digs into the first planting of the season with The Organic Gardner Jeanne Nolan.

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Tuesday, a team of federal health officials arrived in southern Indiana to evaluate a recent surge in HIV cases, which the director of the National Center for HIV/AIDS called one of the worst outbreaks of the last 20 years. We talk with John Peller, president and CEO of the AIDS Foundation of Chicago, to see how Chicago’s infection rate compares to Indiana, what the underlying causes are, and how to stem the tide of cases.

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The World Health Organization warns that the rise of antibiotic-resistant bacteria or "superbugs" means that we could be on the brink of a "post-antibiotic era" in which common infections and minor injuries can once again kill. They say the situation is "so serious that it threatens the achievements of modern medicine." We talk with two experts about the scale of the threat and what we can all do to try and contain it.

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Marisa Eve Girawong, a graduate of Chicago’s Malcolm X College, died in an avalanche resulting from the massive earthquake that struck Mount Everest on Saturday. As the death toll continues to rise, a local medical group is raising money for its partner hospital, Nepal Orthopedic Hospital, in the country's capital of Kathmandu. 

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Officials say the outbreak of the so-called dog flu throughout the Chicago area is now of greater concern than originally thought. Dr. Donna Alexander, administrator of the Cook County Department of Animal & Rabies Control, tells us what the latest findings mean for pets and what animal control officials are doing to contain the outbreak.

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Jack Yonover is one of an increasing number of kids who have to watch what they eat to avoid potentially life-threatening nuts. The Wilmette teeneager is also a budding filmmaker and has created an impressive documentary about the dangers of nut allergies from a kid's perspective. Yonover tells us about his documentary that is already drawing attention from health professionals and film festivals.

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Hundreds of Chicago area dogs have gotten sick and a number have died from what is believed to be an especially virulent "dog flu." A Chicago veterinarian tells us what the disease is, why it's especially bad, and offers advice about what loving dog owners should and should not do.

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Gardening season is just around the corner. To help us prepare for the upcoming season, The Organic Gardener Jeanne Nolan stops by our garden and studio. 

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Doctors told U.S. Army veteran RJ Anderson that he'd never walk again after a motorcycle accident left him paralyzed from the chest down. But, with the help of an advanced medical device, he can. He's the first Chicagoan to take home the Re-Walk exoskeleton -- the only exoskeleton approved by the Food and Drug Administration for at-home, personal use. Find out how it works and how it might have a long-term impact on his health.

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The director of the new film RX: The Quiet Revolution talks about his new documentary that profiles the changing face of American health care and a renewed focus on the relationship between health care provider and patient.

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Tracking the history and treatment of cancer from ancient Egypt through today: we talk with Dr. Siddhartha Mukherjee, author of the book The Emperor of All Maladies: A Biography of Cancer, about a new three-part documentary produced by Ken Burns that begins airing Monday, March 30 on WTTW11.

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A French prosecutor announced Thursday that a Germanwings co-pilot deliberately crashed a jet in the French Alps after locking the pilot out of the cockpit. The prosecutor said there is no indication the crash was related to terrorism. The announcement has sparked questions about mental health evaluations for airline pilots, and why the co-pilot was able to prevent the pilot from gaining access to the cockpit. We have analysis.

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It's Brain Awareness Week -- a global campaign designed to highlight the importance of brain research. University of Chicago neuroscientist Peggy Mason is here to enlighten us all. Take a Brain Quiz!

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We discuss the recent changes in dietary guidelines and how they affect the way we're supposed to eat.