Why aren't plants black? 🌿

I lean towards the last theory. I mean, wouldn't it be great for animals to be able to live of sunlight as well when there's nothing to eat around? But once animals evolved and with them our "parasitic" metabolism, there was no chance for a 2nd design to evolve. Same with intelligent animals other than humans. When our species took over, we unvoluntarily prevented other species from developing the same or even better trait, although some could have, like dolphins. Or our inability to see ultraviolet or to glow in the dark, like some fish can, or our tendency to get obese because in the early stone age, food was so scarce, and whenever we found something to eat, we ate all of it as fast as we could. Or newborns being almost to big for a female pelvis. Or male testicles hanging in a very vulnerable place. Bad engineering, I'd say.

Who knows whether dinosaurs wouldn't have created a better, more peaceful, more enlighted civilizations if it hadn't been for the Chicxulub impact which made us "underdog" mammals the unexpected winners of the Darwinian race? (At least in the vertebrates weight class. Insects and bacteria may have another opinion when it comes to the overall champions.)

So, evolution is not about developping the "bestest" design but to reach a set of abilities "good enough" to drive away or even kill all the competition in the same niche. Which, by the way, is another argument against creationism.

And, @thephysicsgirl, I really like your videos.