So you are saying giants is not possible? You know this by fact? So all the ancient cultures/civilizations that mention giants did it because?????? What do we know about ancient history? How much do we really know about? How many thousand years of information do we really have. Earth is billions years old, how much do we know about realistically? Who built the ancient structures? Not just one, but all the ones no one knows anything about scattered across the globe. You are ignorant, you think you and we know it all when it's obvious we don't know shit if you ever took the time to study history. Everyone is guessing and doesn't know shit pass a couple thousand years. Yet you are positive you know about every species that was alive on this planet. Yeah ok smart guy.
You would be surprised of all the information and ancient findings/structures that countries/nations hide from each other and deny it's existence and won't allow anyone to see and study. Yet here you are thinking you know everything lol.
Also we don't even know where humans came from, people have theories about evolution but still looking for the "missing link" that connects and proves that theory. Plus there are theories of genetic manipulation/engineering so we don't even know much about humans and you think you know everything about giants lol.