civilization on earth

If there was a civilization on Earth that predated humans, would we have discovered them?
Determining the existence of a civilization on Earth that predates humans is a thorny question and attracts the interest of many scientists and archaeologists.
What if we weren't the first advanced civilization on Earth?
Is it possible that Earth once harbored a pre-human industrial civilization? So, what if we weren't the first advanced civilization on Earth?
Evidence of advanced civilizations living on Earth more than 100,000 years ago?
History is always interesting to curious people, for all that we have known, are knowing and will know are only incomplete pieces of the whole picture of the past of humanity.
The cold, deadly alien vision of
According to Dr. Kaku, there is no way that alien races who come in contact with humans will give technology governments the ability to