Fully-opposable thumbs. (Other primates have only partially-opposable thumbs.)
Other species have complex languages (think bee dances); we just aren't tuned in to them. We have no evidence that other species communicate about the past (Koko the gorilla hasn't done so yet using American Sign Language), but we know that elephants remember the past (they avenge killing many months after the fact).
I liked the post about ego and delusion. It helps explain spirituality.
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