According to the research of John Komlos of University of Munich, Czech people are third tallest in the world, together with Swedish and Norwegians. With their average height of 177.5 cm (5ft 9.8) they are even taller than their American counterparts who used to be the tallest in the world not long time ago.
The tallest nation from the ranked states are Dutch people with the average height of 181.25 cm (5ft 11), followed by Danish people with 180 cm (5ft 10). Americans with average height of 176 cm (5ft 9.2) are behind Germans and British.
The reason why some nations are taller than others remains for scientists a kind of mystery. It might be connected with diet and health care.