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The average life span of humans is studied in statistics, being one of the main indicators of wealth and happiness for a country. What is fascinating is to study what determines the life span of humans, and why there are so many differences from one country to the other.

Israeli tennis player Dudi Sela being 5"9" is considered average height. But not next to the tallest professional tennis player in the world. Ivo Karlovic is 6"11" and Sela needed some assistance in congratulating his opponent on his victory.