Meet America's tallest man and its tiniest siblings. He's 7'8". They're 2'2" and 3'2". Dr. Oz explores the unique science of life on a small to grand scale. Here, Igor Vovkovinskiy, who was born with pituitary gigantism, officially breaks the Guinness World Record for America's tallest man. Also, meet Brad and Bridget, a brother and sister both affected by a rare form of dwarfism called primordial dwarfism.
Click here to watch Part 1 and learn how Igor meets the everyday challenges of his condition.
Click here to watch Part 3 and learn more about Brad and Bridget, how primordial dwarfism affects their bodies, and what they're doing to beat the odds.