This is not exhaustive, nor comprehensive. I just wanted to share some fun facts in the form of one-line constructive definitions. The idea is that every word in each non-fundamental definition is previously defined. It is, in fact, not the case. However, you can still use it to learn new things. It also works as a way to roughly judge about the extent of my knowledge ; but it requires the statement that I profoundly understand each of these definitions. It is, in fact, not the case. Enjoy!