Diary in English 2024/9/23

I'm looking for a track ball mouse for using at home, I already have one for my office, so I want another type. 
But you know there are so many kind of mouses, I always have trouble choosing. Not too expensive, not too cheap(it's gonna be a junk soon), easy to use, everyone thinks the same hahaha. 

By the way, I know I'm not very good at it, but I'm the type of person who wants to study the basics thoroughly. I want to "understand", not "know". Memory is not intelligence. So, considering that many students have developed techniques to pass entrance exams by memorization alone, even though intelligence is measured during the exams, it  seems better to make graduation more difficult than the entrance exams. Nowadays, easy entrance is easy graduate in universities excluding correspondence course. I think it is a kind of system bug or something.