Evolutionary storytelling about giraffes' long necks goes back before Darwin, but all the tales have one thing in common: they don't work. Doesn't matter. Evolution marches on.
When unrelated fossils have similar traits, evolutionary paleontologists twist, shove and stuff them into Darwin's theory with an all-purpose tool called convergence.
New research has discovered that the mechanism of motion in sperm tails requires signaling, transmission and highly-ordered elasto-hydrodynamic material.
New research results strongly go against the current politically correct view that the only differences between males and females are a few minor plumbing variations and a couple of small hormones.