Keep in mind I'm paraphrasing this from memory but:
"In my main line of work, we breed fruit flies. We noticed that the some of the more aggressive males would fight over a bit of land, plant, whatever, to court females. We wondered what would happen if we only let the aggressive flies breed, and within 10 generations we had flies that were like Hercules (fruit flies breed very fast which is why they are used to study genetics and evolution). We then reintroduced them back to the more natural population of flies. What ended up happening was; while the aggressive flies were busy fighting, the non-aggressive males were hanging out with the females and making babies. The aggression was quickly bred out and after a couple of generations it went back to initial levels. We often hear the phase 'survival of the fittest' in this field of study, but just a reminder that it doesn't always mean what you think it means."
I thought that was an interesting aside that you might enjoy. 
Hell, everything that goes wrong with humans once you hit 35. After you have a few babies the only selection pressure is being not-miserable enough to provide supplementary care for your grown kids and their kids, which we suspect is a key reason we live so long after peak reproductive years. Your body just needs to work well enough to watch kids until they can take care of themselves to convey that advantage, but there's no selection pressure against lower back pain or your prostate staging a coup the moment you turn 70.
Spines evolved to be horizontal to the ground. Vertical spines suck shit, and knees only work properly when the load is evenly spread between four of them.
Yeah, i've heard it said that we're still in a transitional state and have achieved true bipedalism yet.
The missing ingredient to the achievement of full communism? Proper bipedalism 😔