Why is there anything?

Assuming that the big bang theory is what started the universe in motion.
So there was just NOTHING, and then, there was everything. All in a tiny ball. All that something, came from nothing?

Not seeking creationism type answer.

But how could so much something ( all the things that make up our universe ) come from so much nothing?

There seem to be some good thinkers on fluther. How did this all just ‘materialize’ ?

Like most of us, I gaze into the night sky , and it blows my mind. I see trees, birds, clouds, stars, planets etc. Lot going on. Why?
WTF? If this universe and it’s contents were all just a clock set in motion, where did that original ball of matter originate? Why did it explode? If a small ball of everything came from nothing, could another one just pop up somewhere else and ‘big bang’ again? If there are multiple universes, did they all form in the same way?