I've come to the conclusion that I have 2 truths 1. I know I exist, but not what I am 2. Everything else I want to think I know may be wrong?

Perhaps you, yourself know more truths, I don't know if you do. I doubt it, but I may be wrong.

What's good to know about women?

Last week, we asked you to share with us your knowledge about men. This week - to be fair - we would like to ask you to unravel the biggest mysteries about...

Well, the best suggestion I can give is, aside from not misinterpreting philosophical ideas of certainty, is not to go to Yahoo! Answers.

In all seriousness though, the idea of existential nihilism revolves around believing that the truth is that life is purposeless. In that sense, "why" is meaningless. So, purpose is what you make of it.

The purpose in purposelessness is whatever you make of it. An oddly beautiful sentiment.

And, on calling it "dangerous" and "silly", well, what do you call jihads and Irish religious violence?

There IS nothing to worry about. There are only actions and consequences of those actions. There are no judgments, no punishments. Those are only in your mind.

Of course, there's MUCH, MUCH, MUCH, MUCH more going on than you are aware of. So chances are there will always be something unexpected within the consequences.

You KNOW what will happen if you jump off the building.

The fact that you can say, "Why don't you jump off the building" implies that you are free to make a choice. If the future is written, whether you jump off the building or not is also already written, so why would you say "Jump off the building"? But of course, you're saying that or not would also be written...and so on and so on. You can't escape the fact that somewhere in there, you are free to make choices.

Some A are not B. (T) Contraposition?

a. Some non-B are not non-A. (T)
b. No A are B. (Und.)
c. Some B are not A. (Und.)
d. All A are B. (F)
e. Some non-A are not non-B. (T)