For those of you who are not from MIT, - all MIT students have to take two semesters of physics all undergraduate students. For most students this is the most rigorous exposure to physics they've ever had In the first semester of physics, they study what I think was the basic nonunion mechanics.

如果你们不是麻省理工的学生，要知道麻省理工的所有学生,所有本科生---都得学两个学期的物理,对大多数学生来说,这是他们接受的最严格的物理学习,第一个学期他们学一些,基础力学。

麻省理工公开课 - 媒体、教育、市场课程节选

One of the first things that Physics students learn when they study radioactivity is the idea of the half-life.

FORBES: Radioactive Decay Rates May Not Be Constant After All