There is a new paper out suggesting that the Flores hominids, known as Hobbits, were “human endemic cretins.”From the abstract of this paper:
… We hypothesize that these individuals are myxoedematous endemic (ME) cretins, part of an inland population of (mostly unaffected) Homo sapiens. ME cretins are born without a functioning thyroid; their congenital hypothyroidism leads to severe dwarfism and reduced brain size, but less severe mental retardation and motor disability than neurological endemic cretins. We show that the fossils display many signs of congenital hypothyroidism, including enlarged pituitary fossa, and that distinctive primitive features of LB1 such as the double rooted lower premolar and the primitive wrist morphology are consistent with the hypothesis. We find that the null hypothesis (that LB1 is not a cretin) is rejected by the pituitary fossa size of LB1, and by multivariate analyses of cranial measures. We show that critical environmental factors were potentially present on Flores, how remains of cretins but not of unaffected individuals could be preserved in caves, and that extant oral traditions may provide a record of cretinism.
I have a cousin in law who tells this story: Her youngest child found out about sex. Then he made the connection that if he existed, his parents must have had sex. So he confronted the parents with this, and mom was forced to admit, yes, of course, this is how babies get “made” and this is simply how things are. The child did not seem too concerned.Moments later, the child noticed his sister playing in the other room. A thought occurred to him … a light went on, as it were. He turned back to his mother with an expression somewhere between accusation and perplexity.”You did it twice?!?!?” 
In Genesis 4, we see specific reference to herdsmen and farmers as distinct groups, represented by Abel and Cain, respectively. God indicates a preference for the results of herding over planting, and the sibling troubles that ensue result in the world becoming a difficult place to farm, and humans becoming more nomadic, as herders. This is interesting, because it seems like a dramatic shift from reference to irrigation agriculture to herding. Given the usual role of origin stories, we may be seeing a layering of blame in this case. If this is the origin story of cattle keeping nomadic pastoral people, one has to explain the distinction from farming, and if possible, develop a disdain for the practice of farming, typical at least in Africa of herding cultures. 