I confess I had lived

From http://www.whatthebleep.com/reality/BleepBookCh1.pdf

What IS a Great Question?
Why should we bother?
What makes it Great?

Let’s say a spaceship lands next to you on the coffee table
(does size matter?) and inside is The Universal Book of
Everything. And you get to ask one question.
What is that
question?
This may seem a little silly, but it’s worth the effort. Take a
minute and think.
What would that question be? It can be anything.
Go ahead and write it down in your journal.
Now let’s say The Book is feeling a little underutilized these
days, and you get a bonus question.
Think of something that
you are just plain curious about. It can be wondering if Elvis is
still alive, or where you left your car keys.
Something that
simply tickles your fancy.
Write that down, too.
And by now The Book is feeling a little depleted, and it got
to be The Universal Book of Everything by asking questions of
everyone and getting real answers. So, the question for you (the
answer to which will be added in The Book) is:

What is the One Thing you know for sure?

The debate is open girls. What do you know for sure?