Humans are actually more genetically homogeneous than most people suspect. This is possibly due to a population bottleneck at some point in our evolutionary past. Two chimpanzees from different sides of a jungle are likely more genetically different to each other than any two human beings in the world.
Our big brains may help us use tools, but what was really principal in their development was the need for empathy, communication, and cooperation.
Humans. Are. Social. So social it drove an incredibly energetically costly increase in our brain size. Don’t believe anyone who says its our nature to fight “every man for themself.” We’re humans, not bears. We fight for each other.
And we always have. Fossil remains are found of ancient humans who bore signs of crucial mobility impairments that lived to notable ages. Some even have sticks or other mobility aids – community care and support is our way. We don’t cast off those with impairments, we stand by them.
Human sexual dimorphism is on a decreasing trend. Our ancestors had greater difference in canine size and overall size. Our dimorphism gap has gotten smaller.
Occam’s razor is the principal that whatever is the simplest explanation is probably the most likely one. Don’t believe someone who says the reason we evolved bipedalism is so that males could carry gifts to females to woo them. Yes, this is a real ‘theory’ on how bipedalism evolved.
Skin tone is an adaptation of UV levels vs vitamin D levels. Both come from the sun. UV is harmful, so where sun is plentiful populations develop a darker skin tone for more protection. The skin needs sun to create vitamin D, so where sun is scarce, the skin tone lightens to allow more sun in. This is literally all it is.
Final thing: No one’s mind is really equipped to fully understand how long a billion years is, or a million, or even tens of thousands of years. Evolution takes place over a loooong time. Its very, very, slow, slower than we can really comprehend. We can’t “stand in the way” of natural selection by caring for our ill. We don’t need to “help” evolution in any way. It inevitably happens, but not on any sort of timescale we could possibly affect, so don’t fall for anyone that tells you not to “stand in the way” of natural selection. That’s fascism, and its utterly pseudo-scientific.
Not to mention natural selection doesn’t have a “will” that you can stand in the way of. Its not an entity with wants, its a millions-year long process. And its impossible for our decisions to “stand in its way.” Our decisions to care for one another are what brought our species where it is, plain and simple.
