Could Invisible Aliens Really Exist Among Us?

Could Invisible Aliens Really Exist Among Us? An Astrobiologist Explains The Earth may be crawling with undiscovered creatures with a biochemistry that differs from life as we know it.   By Samantha Rolfe They probably won’t look anything like this. Credit: Martina Badini / Shutterstock. Life is pretty easy to recognize. It moves, it grows, …

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