One show-stopper is enough, but a veteran origin-of-life researcher acknowledges four paradoxes in origin-of-life research that have never been solved.
Unlike humans, hummingbirds are equally good at extracting energy from fructose as from glucose. They are marvels of evolutionary engineering. That makes perfect evolutionary sense.
Examples from World War II and the present illustrate that just because some people compromise ethics doesn't mean ethics itself is a matter of opinion.