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.

Want to know how to look marvelous without splurging so much? Dr. Oz invites three beauty experts to share the smartest ways to save money while looking fabulous starting from your hair and makeup tools to the beauty products you use.