Abiogenesis
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The search for a habitable second Earth
Contact with extraterrestrial life would be an epochal event. Even the discovery of a simple alien organism would be transformative, giving us unprecedented insight into how life forms on Earth and other planets. Yet, there's exactly zero proof that life exists beyond this world -- not one alien germ, spore or cell, let alone an advanced race that could save or enslave us. And we don't even know how life sprung up here 4 billion years ago from rocks, mud and water.
