It’s easy to shoehorn any number of plausible theories, but how do we know one evolutionary theory is the correct one?
See:
https://en.wikipedia.org/wiki/Just_So_Stories#Evolutionary_d...
IMHO, the one that works is the one most likely to result in increased gene propagation even if the percentage is minuscule in the absence of orthogonal genes.
The argument is not that X evolved to do Y, but rather X resulted in increased gene propagation as it happened to do Y.
In the example above, the head of the penis is shaped as such because that shape enables semen displacement. In the same vein, males tend to lose an erection, and therefore the [flaccid] penis loses the displacement property, after excretion because that results in not displacing one's own semen.
And if I'm being truthful, I struggle with evolution a bit. It's a bit like life. I understand how life could have eventually evolved to where we're at. But how did life _start_?
Any specific mechanism is explained as having evolved, but if so, how did it _start_?
For example, there's an HN thread explaining why bees die after they sting and why it's acceptable from a colony perspective. What put bee's on _that_ specific evolutionary track? How did it _start_?
I think a lot of people are like myself, there's a level of blind faith put into evolution. We obviously have witnessed it happening so we know it does happen, but there are so many things we can't explain for sure that forces us to have blind faith it happened via _purely_ evolutionary forces. like ... what if we find out some super advanced alien civilization seeded earth with life and managed it in some way, helping shape things. It would kind of explain a lot.
And so I continue to have blind faith that even if we don't have a concrete explanation for many of the things we see it happened via evolution, but I also understand the skepticism some people have for evolution being the sole explanation.
It really wouldn't!
A simple explanation would be that the aliens are much simpler than we are in makeup because it happened purely by evolution, and that part of our complexity came through planning.
There's just too many possibilities to so confidently claim it's kicking the can down the road.
> the aliens are much simpler than we are in makeup because it happened purely by evolution, and that part of our complexity came through planning.
That looks like argument from complexity. And it seems that complexity through planning would require an even more complex creator, not a simpler one.
> There's just too many possibilities
I don't think it makes a difference either way. If we can figure out one way of making life from non-living matter, we've cracked the code, we don't need to know how exactly it happened.
Simplicity implies understanding and intent.
No one would design the absolute spaghetti code mess that underlies our existence.
Look at the computers we build. Neat little rows and friendly little abstractions.
Life isn't. It's billions of years of good enough hacks layered one atop the other, and sometimes transitioned sideways from other forks of the code base.
Near half our DNA is just viral cruft that got mixed up and passed along for untold generations.
>Eight percent of our DNA consists of remnants of ancient viruses, and another 40 percent is made up of repetitive strings of genetic letters that is also thought to have a viral origin
It's just fun to think about.
I'd call it common sense, more than blind faith. You see a person dead on the floor with a bullet wound, and a handgun laying next to the body. Concluding that the victim was shot to death is common sense, not blind faith. In that sense, evolution is more like playing detective, all the evidence is pointing to it.
Blind faith implies both lack of evidence ("blind"), and rigid loyalty to a specific idea ("faith"). Common sense implies neither of them.
https://search.brave.com/search?q=definition+of+faith&source...
> Faith
> 1. The assent of the mind to the truth of a proposition or statement for which there is not complete evidence; belief in general.
> 2. Specifically Firm belief based upon confidence in the authority and veracity of another, rather than upon one's own knowledge, reason, or judgment; earnest and trustful confidence: as, to have faith in the testimony of a witness; to have faith in a friend.
...
> 5. Intuitive belief.
We have a hypothesis that the penis _evolved_ due to it's ability to scoop out semen. A part of that hypothesis is that this is why longer penises evolved, to place semen in places that cannot be scooped out by other men.
But another explanation for larger penises is that women find them more attractive and pleasurable and therefore it increased your chance of mating.
Another would be that larger penises are statistically more likely to get a woman pregnant in general, with or without a bulbous head.
But here's one for you. The original hypothesis about the penis head came from an experiment in which they found that a single thrust could potentially pull out 90% of a competitors semen. We won't discuss the logistics (they didn't use real people), we'll have _blind faith_ that the experimenters ensured it was realistic.
Men ejaculate in spurts over a time period that is larger than what it takes to thrust a single time. This would imply the penis head also removes it's own sperm quite often.
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The point here is that
1. We don't know, and 2. We can't know without actually documenting the process.
This sub-thread was brought about by someone saying "how do we know this is true", and the answer is, we can't know, therefore we take it on blind faith.
If you're offended by the phrase blind faith, use whatever phrase you like. But while you're doing that, please watch that youtube video. It will help you better understand why it's more useful to discuss the underlying idea than to discuss if we should be using word X or word Y.
If you're talking about evolution in general, then it makes a large number of predictions about the way things are, that have borne out.
If you're talking about penises scooping out semen, the answer is we can't know, therefore we take it on faith—the answer is we don't know, and so it's one of several hypotheses—none of which are mutually exclusive. Nobody is (or should be, at least) taking it on faith, because nobody should be asserting it as definitely true.
That's on you, brother.
I choose to call it blind faith and the other poster prefers to call it common sense. If a 3rd person wanted to call it guacamole I'd be onboard.
The other poster insists on arguing about the name rather than discussing the interesting part, which is underlying idea. They want to do this based upon the whole "science vs religion" thing that was boring even back in the 90's when it was raging.
I have no interest in it and so I've stepped out of that conversation. Let someone else take up a stupid, useless, argument.
Firstly, this is a misreading of the video. The absurdity of this position can be seen from extending your example through replacing every noun in your comments by "guacamole".
Secondly, "blind" is an adjective, and one that you use at every opportunity (except where you are looking up definitions - by the way, isn't looking up definitions an odd preoccupation for someone who doesn't see anything of importance in what you call something?) It is well-known that you cannot outright prove anything about the natural world by induction, but to lump everything that is not proven into the category of specifically blind faith ignores the epistemic value of evidence and just leads to what you call a stupid, useless, argument.
Ouch. Funny though.
Evolution doesn't explain how life started (or attempt to explain), just how it changes over time. How it started is obviously a really interesting question, but not one you can use evolution to understand. Evolution explains a specific thing, not everything.