Why poltical science called science?

Well, we soon learned that political science is not about the real world but only about those features of the world that can be studied by methods deemed to be scientific. We were told though not necessarily in these Words-that if something can't be measured, then that's not it, and if an event didn't happen twice, then it didn't happen. This might be a slight exaggeration, but I don't think it's a caricature. With all the more interesting questions falling outside the bounds of scientific investigation, political science often strikes the new graduate student as an unending war waged against his or her curiOSity.