Publication highlighting the exceptionalism of human existence.
Abstract: According to the “hard-steps” model, the origin of humanity required “successful passage through a number of intermediate steps” (so-called “hard steps”) that were intrinsically improbable in the time available for biological evolution on Earth. This model similarly predicts that technological life analogous to human life on Earth is “exceedingly rare” in the Universe. Here, we critically reevaluate core assumptions of the hard-steps model through the lens of historical geobiology. Specifically, we propose an alternative model where there are no hard steps, and evolutionary singularities required for human origins can be explained via mechanisms outside of intrinsic improbability. Furthermore, if Earth’s surface environment was initially inhospitable not only to human life, but also to certain key intermediate steps required for human existence, then the timing of human origins was controlled by the sequential opening of new global environmental windows of habitability over Earth history.
In this episode, biochemist Fuz Rana describes recent work from researchers at Rockefeller University. The researchers edited specific mouse genes to express the human version of the protein NOVA1, and they believe their research explains human language capability. Their findings add evidence for the exceptional nature of human beings and, consequently, the image of God.
Hugh discusses how four astrobiologists assert that intelligent life is the natural outcome of a hospitable environment. They note that the origin of life and every advance in Earth’s life occurred when physical and chemical conditions first permitted their appearance. Hence, they conclude that these appearances of life must be naturalistically straightforward and rapid. The team proposed a test of their hypothesis: exoplanets with the necessary physical and chemical conditions for each “hard step” in the origin and history of life will prove to be common and, in each case, chemical signatures for that life step will be found. Do the findings support their hypothesis?
