Please, my intention is just to remind our friends here:
while having fun, please do not establish inaccurate or even wrong concepts in your minds, as particularly I noticed that many of the readers are young students, a wrong concept can be quite harmful for them.
I am not "bombarding" anyone, sincerely. :) If anyone feel annoyed or offended by my previous post, I must apologize.
The other two reasons I did not reply to "correct" the mistakes on spot are:
1) it was just shortly after it is posted, I wanted to leave more time for other people to think and enjoy. Yet very often, after a while, the topic got buried by many new questions posted, even if I went back to correct them, nobody would read them again.
2) it was standard textbook concept. Repeating it here will be redundant. And if due to limited space and time, my brief answer happened to be inaccurate as well, it would do even more harm.
That is why I suggest our friends to read some basic books on the topics first.