How do researchers determine what is true based on the data they collect? This question is one of the central concerns of statistics, which uses mathematical models to draw useful conclusions about the real world.

Spanning many countries and island territories, South America is home to many Spanish-speaking countries. Here, students can literally walk through history on their way to class and soak up the culture of ancient societies.

Academic institutions around the world award advanced diplomas to students who complete specific course requirements. The time it takes to earn an advanced diploma varies depending on the university and the particular course of study.