Excerpt: “When people of both sexes walk together, either both sexes must pay an energetic penalty by compromising speeds (as seen in the Partner-Friend dyad) or the male must pay an energetic penalty to accommodate the female’s speed (as seen in the Partner-Partner dyad).”
My sarcastic comment: Apparently, women slow men down by indirectly controlling our pace. Thus, the results of this research appear to exemplify sexism. It is good that they made this connection among friendly dyads to avoid linking the results to an evolutionary “foot” race, which could be compared to an evolutionary arms race based on a theory of mutation-initiated natural selection for walking speed.
The issue of the evolutionary arms race and the foot race could get ugly. Someone would eventually ask what mutation initiated the natural selection for walking page, and men and women who did not know the answer would be forced into angry name-calling with exchanges of “I’m not a mutant; you are.”
What? You heard me — that’s what the latest research on human sociality has inadvertently taught us. The human study confirms what some of us have also seen the video representation of lizard leg length, color, and predation. We are now assured that reproductive isolation islands results in the same changes in DNA on the islands due to predator-driven natural selection for color morphs. See, for example, the 17-minute long video: The Origin of Species: Lizards in an Evolutionary Tree.
Clearly, this video supports the snake-centric view of human brain evolution due to snake predation of monkeys living in trees taught to us by “Pulvinar neurons reveal neurobiological evidence of past selection for rapid detection of snakes.” See also: Evolutionary relevance facilitates visual information processing. If you like the theory of mutation-driven natural selection, do not see Olfaction spontaneously highlights visual saliency map. Too many biological facts are integrated in the results from their experiments. They “…reason it was spontaneous binding between congruent olfactory and visual information  that formed a multimodal saliency map where the visual object with added olfactory presence gained increased perceptual saliency.” That reasoning, which is based on physics; chemistry; and on biological facts, does not fit what’s being taught to students about human evolution. They’re being taught that we adaptively evolved from lizards due to snake predation of monkeys in trees.