On Feb. 22, 1918, a perfectly normal 8.7-pound boy was born to Harold and Addie Wadlow of Alton, Illinois.
By his first birthday, Robert Wadlow weighed 45 pounds and stood 3 feet, 3.5 inches.
He kept growing, towering over his father at age eight. At 13 years old and 7 feet, 4 inches, he was...