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. Learn more about 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 Vovkovinskiy, who was born with pituitary gigantism, meets the everyday challenges of his condition.
Click here to watch Part 2 and see Igor officially break the Guinness World Record for America's tallest man, and learn more about primordial dwarfism.