What do you guys think: do we have free will or don't we?

EDIT:
When I say "free will", I don't mean that you can fly or something like that: free will simply means that your thoughts and feelings are not controlled by nature but they are controlled by you and you alone.
Think about free will in this way:
If you could go back in time and your memory was restored to exactly how it was back then, could you have done things differently to the way you did them the first time?
If your answer is yes, then you believe in free-will.
If your answer is no, then you don't.
So - what do you believe ?
EDIT:
When I say "free will", I don't mean that you can fly or something like that: free will simply means that your thoughts and feelings are not controlled by nature but they are controlled by you and you alone.
Think about free will in this way:
If you could go back in time and your memory was restored to exactly how it was back then, could you have done things differently to the way you did them the first time?
If your answer is yes, then you believe in free-will.
If your answer is no, then you don't.
So - what do you believe ?
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