Robert Pershing Wadlow was recorded as the tallest person and male in the world. He was also known as the Alton Giant and the Giant of Illinois. He had a height of 8 ft 11 inches. He is not alive now. Addie Johnson and Harold Wadlow in Alton, Illinois, gave birth to Robert on February 22, 1918. He has an average height and weight at birth. He drew attention to himself when at six months old, he weighed 30 pounds. He continued to grow at an astounding rate, reaching six feet, two inches and 195 pounds by the time he was eight years old. Wadlow reached 8 ft 11.1 in height and weighed 220 kg at his death at age 22 on July 15, 1940. A special desk has been made for him in his elementary school due to his size. He was 8 ft 4 in when he had graduated from Alton high school and afterwards he was enrolled in Shurtleff College for studying Law.

Reasons of increasing height: His size always grows in every stage of his life. This was a problem of hypertrophy. This was due to hypertrophy of his pituitary gland, which results in an abnormally high level of human growth hormone. He showed no indication of an end to his growth even at the time of his death.

Others history: Despite Robert's size, all of his family members were of normal height and weight. Robert enjoyed collecting stamps and matchbooks and taking up photography. At the age of 19 he joined the Ringling Brothers Circus and at age 20 he came a goodwill ambassador for the International Shoe Company. While otherwise remarkably healthy, he did have considerable trouble with his big feet. He had little sensation in his feet and did not feel any chafing until blisters formed. While making an appearance at the National Forest Festival in Manistee, Michigan in July 1940, a fatal infection set in when such a blister formed. On July 4th, doctors had Robert confined to a hotel bed, unable to find suitable accommodations at the local hospital. Wadlow was a 'Freemason' and he had the largest Freemason ring in the World. On July 15th, after an emergency surgery and blood transfusions, Robert passed away in his sleep.

Let's have a look at other giants as well. At number 2, we have Angus MacAskill. This scottish natural giant, of about 7 feet 9 inches, has no growth abnormalities and had perfectly normal proportions. He had the largest chest circumference (80 inches) for any non obese man. Next in the list is John Rogan. He was often known as the "Negro Giant". He earned for a living by selling portraits and postcards at local train station. He was measured at 8 feet 9 inches at the time of his death.