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The human brain is a complex and intricate machine that has long been a source of fascination for scientists and researchers. While it's difficult to pinpoint exactly what makes humans so unique, there are several key factors that set us apart from other living beings. One major difference is the ability to think and reason abstractly, which allows us to create complex ideas and concepts that have no basis in reality. This cognitive ability is something that has been honed over millions of years of evolution and is still not fully understood by scientists today.