@Dong well, I know about that also. Even I also learnt about those things in ages 11. nowadays I just don't want other people to know about it or learn about it. Rather they should learn those things after 18 or 20 in times of necessary. Which is why I hope every people who knows about those things should suggest to let other learn those things after reaching 18 or 20 years because nowadays even 9 to 8 years knows what is six and other things related to it.
Time is all thing and all the things are time