I’m tall. Most of the people in my family are tall. Does that mean my son will be tall? Turns out the inheritance of height is a lot more complicated than we thought. Scientists know that nature (genes) and nurture (environment) both play a role, but after more than a century of questions, we’re only just now starting to get some answers 

1. What is the average height of an American guy? 

2. Who are considered the tallest people in the world? 

3. How did history affect people’s height of today?