Hagia Sophia: Istanbul's Mystery Preview

Extras

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  War Threatens Ukrainian Nuclear Power Plants

  Ukraine's 15 active nuclear reactors generate about half of the country's electricity.

  7:09
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  The Mammoth Species You've Never Heard Of

  These bones could have belonged to some of the last surviving steppe mammoths in Britain.

  3:00
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  These Artifacts and Foods Tie Modern Maya to the Past

  Oral tradition talks about the importance of these foods for Maya.

  4:04
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  Climbers Tell Story of Mt. Washington Climbing Accident

  Climbing partners have a harrowing experience on Mount Washington in NH.

  5:10
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  Why Wombats Poop Cubes

  Biologists and engineers solve a major marsupial mystery.

  3:00
• 

  The Evolution of Prosthetic Leg Technology

  Amputation procedures haven't changed much since the Civil War era.

  5:11
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  Inside the Mind of Alzheimer’s

  Journalist Greg O'Brien gives a first-hand account of what it's like have Alzheimer's.

  4:23
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  Determined: Fighting Alzheimer's Preview

  Follow three women enrolled in a new study to try to prevent Alzheimer’s.

  0:28
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  Animal-to-Human Organ Transplants

  In a first, a 57-year-old man received a heart transplant from a genetically modified pig.

  4:59
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  Increasing Access to Brain-Controlled Prosthetics

  Bionic interventions might allow people to one day design their own limbs.

  2:55