所有科学都对理解宇宙和人类在其中的位置感兴趣;然而，自然科学通常专注于帮助学生通过观察和实验了解能量和物质如何结合起来影响物理世界。

Courses are academic classes taught by qualified instructors that are intended to enhance participant’s knowledge of a given area or training in a particular discipline. Courses vary broadly in terms of length, size, content and duration.