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There is no doubt in my mind that we are not alone.
How long was planet Earth around before humans came into existance? It's possible that another planet had intelligent life tens of thousands of years before we came around? If this is true, then another form of intelligent life was alive and could have tens of thousands of years of history before we came into being - and the knowledge that would go with it.
If bears can sleep through the winter, is it not possible that another race can sleep for years while traveling through space?
The question is if they have visited us already, why haven't they landed and said "here we are". If they are able to do space travel at this level, clearly they are much smarter and more advanced than the human race - and wouldn't be afraid of us.
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