Who are the tallest people in the world?
The Dutch are the tallest people in the world, with an average height between 175-176cm (depending on your source). The Dutch man drive this number up, with an average of 183 cm, the dutch ladies are only 171 cm on average. 

Why they are so tall is unknown. Some think it is a combination of genetics, universal healthcare, and dairy at that delicious Gouda cheese consumption - others think the local delicacies called "bitterballen" might have something to do with it.