"In the last few years, two paradigms underlying human evolution have crumbled. Modern humans have not totally replaced previous hominins without any admixture, and the expected signatures of adaptations to new environments are surprisingly lacking at the genomic level."
"Until recently, the out-of-Africa model of human evolution was favoured by most genetic analyses, but this model collapsed when the sequencing of the Neanderthal genome revealed that 1%–3% of the genome of Eurasians was of Neanderthal origin. At the same time, refined analyses of modern human genomic data [1]–[3] have changed our view of evolutionary forces acting on our genome. While most people assumed that the out-of-Africa expansion had been characterized by a series of adaptations to new environments [4]–[6] leading to recurrent selective sweeps [7], our genome actually contains little trace of recent complete sweeps [2], [3], [8] and the genetic differentiation of human population has been very progressive over time, probably without major adaptive episodes [9]"
We know evolution is a fact...
"Genomics has revealed that the genome of Eurasians is partly of archaic origin, and genome-wide patterns of diversity have not revealed expected signals of adaptive selection in humans. The sequencing of additional archaic hominins should be helpful to distinguish between alternative scenarios of admixture, infer the timing and the geographic location of admixture events, and assess human migration routes over Eurasia. Archaic admixture can also seriously impact estimated human demography, which should be revisited to account for differential introgression among human populations. Scenarios of human evolution need to be geographically coherent and integrate range expansions during which deleterious mutations can readily surf and accumulate on wave fronts, giving later fuel to background selection.
Whereas our view of human evolution has drastically changed over the past few years, it would be pretentious to believe we now know the true history of modern humans and that we have identified all selective forces that have shaped the diversity of our genome. However, progress in the analysis of modern and ancient genomes is likely to soon provide the data that will allow us to test complex scenarios of human evolution and contrast the role of various selective forces that are currently or were acting in our genome."
PLoS Genetics: Genomic Data Reveal a Complex Making of Humans