We are going to write a program, a bit program, lots of stuff happening here and there, ok, big program. Now, lots of threads of course, loads and loads of them, we have to synchronize, yes we do, I think so, yeah, synchronize very important stuff, good idea, but, why? Remember what we have been taught in school? That mutex thing? Mutual Exclusive? That 2 threads are trying to read and write some mutual value at the same time and create a big mess?