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In his book Sapiens, Dr. Yuval Noah Harari explains that at one point, there were more than just Homo sapiens roaming the Earth 1 . In fact, there were likely as many as six different types of humans in existence: Homo sapiens, Homo neanderthalensis, Homo soloensis, Homo erectus, etc. There’s a reason Homo sapiens still exist today and the others didn’t continue to evolve: a prefrontal cortex, which we can infer from skeletal structures. Essentially, we had the ability to think more complexly, thus were able to organize, cultivate, teach, practice, habituate and pass down a world suited for our survival. Because of our capacity to imagine, we were able to build Earth as it is today out of virtually nothing.
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