Showing posts with label humans. Show all posts
Showing posts with label humans. Show all posts

Saturday, 30 May 2009

My Mom's a Monkey

Okay, not really, of course. She's an ape, a primate, but lacking a tail, she's no monkey, and her ancestors never were either. They were primates, like her, going back to the days of lemur-like creatures. And rather famously all over the news of late, we have discovered Ida, a precursor transition fossil, showing the links between monkeys and apes.

A note about terminology. The press loves to use the word "missing link", crowing about discoveries, as do the Literal Creationists, decrying the truth of those same discoveries. In truth, scientists don't talk about ideas like "missing links". It implies that there is something missing out there, in particular, linking two organisms or two species, and that it can be found. This makes for a convenient idea with Literal Creationists, as they can always suggest that the Missing Link has yet to be found. But there can never be such a thing.

As Zeno pointed out long ago, you can never reach the halfway point; as Heraclitus said, everything is in flux, so you can never jump into the same river twice. (His disciple pointed out you can never jump into the same river once.) Species are not concrete entities- they are constantly changing entities, in every generation. There is not a time when you can point to this and say it is Homo rhodesiensis, and to another, and say that is Homo sapiens. There is not an individual or fossil individual that would be exactly halfway in between, to be "the moment" when the transition occurred. It's not logically possible.

But evolutionary science dictates that you also can't find that transitional moment, even if it was there. Fossils are simply too rare, so that the vast majority of the 99% of species that have gone extinct will never be found. Certainly, it's possible that we have occasionally come across such an individual, who is roughly halfway between two other known species- but the odds are simply too much against it. And if we do find a halfway point, we would then have a new Missing Link to discover, between that species and the first, ad infinitum.

This is why scientists, as opposed to Literal Creationists and the media, discuss "transitional fossils". These are fossils that represent a half-way point, like the wondrous Tiktaalik, but we recognize that this species is not actually in our evolutionary history, but was probably a branching point, much as Homo erectus is a cousin, and not an ancestor. Evolution is not a tree with most branches reaching the top, but a Christmas tree, with the vast majority of species going extinct. We find only clues in different organisms that would give a sample indication of what would be a halfway point- a transitional fossil.

And Darwinius masillae, Ida, is just such a transitional fossil. And of course, as soon as she was discovered, there was the litany from Literal Creationists and Intelligent Designers that she wasn't a "missing link", and we still needed to find the real missing link etc. But there was another line of attack, suggested directly or indirectly by various people- that there is no way our ancestor could be a "monkey". Again, evolution doesn't suggest this, and Ida is no monkey. But more intriguing is why there would be such a visceral reaction to the idea of one's ancestors being monkeys.

One repeatedly runs into the idea that this in some way diminishes humanity, if our ancestors are monkeys. And though there is some resistance from the same groups to the idea of ancestors being fish, or bacteria, or amphibians, it is the monkey and "gorilla" idea that most offends. And this seems a bit odd. Why would this be the case?

There may perhaps be a relic from the egregious ties of African-Americans to monkeys, a legacy we thought was past, but is still used to this day in reference to even the First Lady. It may be that some few individuals still think this way, and don't want their (white) selves tied to the same insult they perceive of African Americans. But this can't be true for the majority who strenuously object to any ties between us and monkeys. Again, they reject Evolutionary Theory, but they have a more visceral reaction to this particular connection, claiming that it somehow diminishes humans to be tied in his manner. Continuously, in the objections to our tie to monkeys, comes the idea that it diminishes humans- and this is found in the earliest objections to Darwin's theory.

This is a mystery. For the majority of these people are Christians. And they follow a text that says humanity was made from dust, that God considers us as so still. We are but worms- even maggots! Is not a worm, and even a maggot, a far worse comparison that that of a monkey? The Bible makes it clear that we are nothing on our own, in our own status.

In the emotional objections of the Literal Creationists (as opposed to the reasoned objections), one continuously gets the idea that humanity must be elevated, as if they believed that what Hamlet says in jest should be so in truth- What a piece of work is man?!

And yet, in those same passages, it is clear that because of our nothingness, God cares for us. It is precisely when God calls us worms that he says he will help us. It is when he calls us dust that he rises in pity. God cares about the outcast and the downtrodden first. He desires to be the servant king. He asks only that we ask for his help, that we affirm that we are nothing without him.

Which leads inexorably to one conclusion. The writings of Literal Creationist and IDists indicate that they reject the tie to monkeys because it lowers our status. Our lowliness of status is affirmed continuously in the Bible. Indeed, the Bible ties directly our lowliness of status to the compassion of God, and, to the extent that we affirm our lowliness and need of him, he comes to assist us. And so, when any of us reject our lowly status, or any status because we perceive it as lowly, we reject the offer of help from God, and reject the idea of God as God.

Sunday, 15 February 2009

Unintelligent Designer

Scientists have been able to create a model of what our Australopithecine ancestor's heads looked like- and in particular their jaws. They've found that our ancestor-cousins had much stronger jaws than we do.

I know everything is a trade-off. I know that if they had really strong jaws, then there was probably some detriment too. It's not like evolution dictates that things get better and better, but rather that every organism just gets continually adapted to changing environments. I still want those strong jaws that could crush large hard nuts.

I wish I didn't have lower back problems. But I know I must, as all humans do with age, because I walk on two legs. I know my back works better for a four-legged animal, but evolution works with the material it has. If I walked on four legs, then it's unlikely that I would have developed the intelligence I have to post blogs, for it is believed that intelligence was a byproduct of being able to see for greater distances and judge distance when standing on two legs in the savanna- not to mention the ability to use tools because my hands are freed from walking. If I had a narrower stance, then the vertebrate I have would work just fine on two legs, thank you. But then women would have a narrower stance. (Sure, women could have lower back problems only. But 1) that would be sad and unfair, and 2) evolution works with what it gets.) If women had a narrower stance, then they would be unable to fit our rather bulbous heads through the birth canal. If we had smaller heads, they could do it, on two legs, without back troubles. They could even have fewer birth pains, for they could keep us in longer, and allow us to develop further, as our head wouldn't be too large for the birth canal upon emergence. The trade-off of intelligence is so great, that our heads are not only too big to fit through a narrow birth canal, but we have to be born neotenously, born with fewer developed features than most animals, including other primates. That means we are dependent for post-natal development on our parents, to a ridiculous degree not seen in other mammals or primates.

If God is a smart God, could he have created us with all of these features? Could he have found a way to have us walk on two legs, be smart, give birth without pain, have short gestation periods, have short post-natal development, have working back bones without pain, and yes, most importantly, super strong jaws capable of crushing hard nuts? Yes, of this I have no doubt. The God I believe in could have done that all. So why didn't he? Why didn't he make us with bodies that work better than they do now, with cooler add-on features?

I have forced to conclude he is stupid. He made mistakes. If, that is, I believe he created using a snap-your-fingers-with-a-brilliant-flash-of-light style, like Q of Star Trek. And I just have trouble believing that a stupid God rules the cosmos. If however, I believe that God created using the process of evolution, then suddenly everything falls into place. Evolution is an incredibly beautiful and complex theory, and it would take the truly divine- and truly intelligent- to come up with such a process. And evolution doesn't create novel structures and processes; it works with the material it has, using work-arounds, to develop new features that are in truth new ways of using old features. And I have the confidence that one day, we will receive just such a body as here described, when we receive our new, fully physical bodies, made like Jesus' post-resurrection body, able to do far more than we can now imagine, where there will no longer be any pain or suffering.

So, the choice is: A smart God, using evolution, or a Literal Creationist God, who is rather stupid. You decide.

Thursday, 22 February 2007

War Dance, It's a Sin

According to World Science, playing video games makes for good surgeons (which we already knew from watching Scrubs); archaeologists are rethinking how important the Clovis people were in Native American history; birds plan what they're going to eat (or at least scrubs do); and there's a new genetic link to autism (again). Oh, and we found some wild chimps who came up with the idea on their own of making and using spears to hunt other animals.

That's kind of big, actually. It used to be we were the only ones who made plans as a species (those scrub jays proved us wrong there). It used to be we were the only ones who built homes (bowerbirds). We were the only ones who used language- except for animals too numerous to mention. But at least, please God, we are the only ones who develop our own weapons of warfare? Please, at least we are unique in this respect?

No, looks like others can do this too.
Pan troglodytes has been found doing the nasty, finding new and inventive ways to kill others. They appear to have figured this out without any human help (although room must be given for the possibility of them observing humans). This particular tribe of chimps cuts off branches, sharpens them with their teeth, and then goes on hunting parties, which are at least occasionally successful, having killed a bushbaby, a relative of the chimp. They don't just go after rats or pigs, they even attack their own relatives. Just like us. Next thing you'll know they'll be writing their own blogs.

The article discusses how this has far-reaching implication for how we understand our own evolution. Tool use has been thought to be limited to the genus Homo, based on archeological evidence. But if Pongidae can use tools, then perhaps tool use was far earlier, with Australopithecus. After all, all fossil evidence is very limited, and tells an incomplete story. Additionally this particular chimp tribe was composed primarily of adolescent and young adult spear-hunters, whereas most chimp hunters are older adults, bolstering the idea that innovative ideas are learned quicker by the younger generations. And the spear-hunters are mixed gender, unlike most chimp hunters who are exclusively male, indicating that perhaps the first tool inventors were of both genders, as other evidence also indicates.

But besides this being a blow to our ego in uniqueness, this discovery also might have something to say about the nature of evil and warfare. In the Genesis myth the humans are cast out of the garden for eating of the Tree of the Knowledge of Good and Evil. It had a long name, and justifiably so. But we usually truncate that name, wanting to call it the Tree of Evil. I think there is a valuable point in the long name. It was when we humans were able to distinguish good and evil, as God makes a point of later in the story, that we also were capable of sin. And the ability to distinguish good and evil requires a certain higher reasoning, a certain cognitive development. To know that this or that action is absolutely wrong, or absolutely right, means I have to have a certain level of thought. Before that point, the action is morally neutral.

It might be argued that a dog knows if it's done something wrong. But the dog knows it's master believes something is wrong, or right, and learns to internalize that. Don't eat the master's children. That's bad. Doesn't matter that my wolf ancestors might have done that, if I do it, I don't get food, I sleep outside, or I get killed. It learns new rules. But the dog is simply incapable of understanding the more abstract notion of an absolute right or wrong.

If I lack a certain level of thought, I can plop my children in another live being and have them eat that other being alive as much as I want. I am not sinning. I simply don't know right from wrong. I can have sex with my sister while still inside the womb, and then die, and my children do this over and over again. It's not wrong- there's no brain, and certainly no higher thought involved.

But the moment I reach that point, that magical level of thought, be that in the Upper Neolithic, or the beginnings of Homo sapiens, or when Hominidae first arrived on the scene- whenever that happened- I knew good from evil. The moment we were this aware, we sinned. Sadly, simply on this level of reality, intelligence could not be divorced from sin. For we were aware of the difference between the two, and we always end up choosing, at some point, no matter how insignificant, sin. We choose to miss the mark and turn from God and good.

The chimpanzees invented spears. They're hunting another species, but another primate. In all the millenia of chimpanzee evolution, odds are they've done this before, if they came up with the idea now. It's not necessarily a new idea with humans. The chimpanzee might use the new invention on each other, as we once did. After all, there are attacks and infanticide and matricide and all kinds of killing among wild chimpanzees- including clan warfare. Spears would just give an edge. But there is a difference. When we do it, we know good from evil, even if we've forgotten. When we invent gigantic spears that can fly across the Atlantic and impale hundreds of thousands in a single flash, we know what the evil is, and what the good would be. The chimpanzees don't. They operate out of forethought, and a certain degree of intelligence, but they have not learned the difference between good and evil. Likely the ability to invent spears was there before we reached this cognitive development point. Likely we even invented spears and attacked other clans with them. But at the point when we first learned enough to know good and evil, we also learned it was wrong, and it became wrong.

And likely the same moment when we could reason well enough, when we reached the ability to sin, is when we also were designated in the image of God, capable of fully cognitively worshipping the Creator.

Monday, 22 January 2007

The last shall be first.

Ducks will negotiate over how much they help each other in parenting. Scientists find the area of the brain that is responsible for altruism. Rare black diamonds may come from outer space. The earliest records of Homo sapiens sapiens in Europe have been found, near Moscow, 45,000 years ago, with the earliest sculptures, in the form of small heads.

And winning the Nobel Prize adds two years to your life. They were able to determine that the money was statistically irrelevant. It's the social status that's gained that extends the lifespan- but scientists aren't sure what the mechanism is.

This brings up some intriguing questions. What is status? Does the social status need to be in the eyes of society, or in the eyes of the individual? Is the gain in life from the undeterminable perks from everyone looking up to you? Or is it from the well-being that you feel as holistic being, knowing that you are valued? Or perhaps from the well-being you feel in valuing yourself?

The determination of status will very from culture to culture, and within cultures. If this is true, the Masai with the most cows will live the longest. (But you'd have to do that study separating out the economic value of the cows.) What if status is determined by how simple your lifestyle is? An Indian Guru has high status in part because he is an asthetic. When I was growing up we valued the person who could go procuring the best (dumpster-diving).

We used to play a game when I was a child and we were standing in line. We'd all try to be in the last person in the line. We'd heard that Jesus had said "The last shall be first, and the first last." In our primitive understanding of that we'd try to be the last in line, and playfully make fun of the person who was in front, because they'd get to go to Heaven last. As kids we didn't really understand the meaning of the passage, but there is a basic point there. If you're following the ethics of Jesus, then status doesn't really matter. You shouldn't be figuring out if you'll be sitting at the right hand of Jesus, or even Alfred Nobel. You should strive to be the last, to take the worst seat, and be like Jesus, with no place to lay your head and without wealth. In doing this, you'll be offered the best seats, and be first in Heaven and the Kingdom of God. So if a society has this standard of social standing, does that mean the poor and debased would live an extra two years?

No, because part of that debasement is for the left hand not to know what the right hand is doing. To say your prayers in private to avoid the honor associated with prayers, and to give in private so your reward will be in Heaven, and not here on Earth. Were status to be gained in the doing of these deeds, they would no longer be following the Way. If status were given for being poor, the Poor would quickly cease to be so. Two years might be gained for the attempt, but it's hardly the original call.

Here's the deal. Jesus' path wasn't a call to social advancement. But it wasn't even a call to a good life. It was a call to a hard life, with a lot of suffering. He told everyone to pick up their electric diodes, apply jelly to their skin, and sit down in the chair to be electrocuted. (Modern translation.) It is a call to expect death, and indeed to welcome it for the Joy of seeing the Lord and serving Him. It is being willing to die. It is therefore completely contrary to that evolutionary call that runs through all of us to reproduce and live as long as possible to reproduce as much as possible. It is perhaps akin to those Australian Redback Spiders, wear the male says to the female, "Take, eat, this is my body," and jumps into her jaws. But he does this in order to have a better position for mating. We're called to jump into the jaws of our oppressors as our Lord did, with no hope or expectation of improved mating.

Evolutionary paradaigms are descriptive, but there is nothing in them that must be prescriptive. And I increasingly believe that the Christian moral paradaigm is to negate evolutionary drives. It is not as if God made a mistake when he set up the paradaigm of natural selection. But creatures aware of good and evil as we are have a different set of standards. The female Australian Redback Spider is not committing any sin when she feeds off her mate to feed their new children.

Different societies have different standards. Most societies seek to elevate themselves in order to gain status, power, and wealth. Is it any wonder then that the scientists chose to do their study of status and longetivity on Nobel Prize winners?

Saturday, 18 November 2006

Who's Your Daddy?

Today's World Science revelations included Spider Monkeys having developed a natural perfume based on leaves (naturally used most often by the males); dark energy has been around for a long time and is causing the universe to expand at an increasingly fast rate; red wine is good; and new subatomic particles. I'll be focusing on the sequencing of Neanderthal DNA.

This is pretty cool stuff. Based on a Neanderthal thigh bone they have found a genetic similarity between us and them of 99.5%, although in many places they are more similar to chimpanzees than us. (By comparison humans and chimpanzees differ by 96%, and rats from mice by ten times that amount.) The DNA shows that the last time we had a common ancestor was 706,000 years ago, and that our DNA hasn't mixed for the last 330,000 years. (The last time chimps and us had a common ancestor was 6 million years ago.)

We, Homo sapiens, arrived in Europe between 40,000-50,000 years ago. Neanderthals disappeared completely between 33,000-24,000 years ago. And ever since then scientists have wondered why.

There's been two primary hypothesis. Firstly that we killed them off. This makes us somehow better adapted to the climate. We didn't necessarily have to kill them off through warfare- it could have been that we simply outcompeted them for space and food, though some studies indicate signs of violence on Neanderthal bones. Perhaps the change in climate at the time was one that Neanderthals were pre-conditioned to not be as adaptive to, but our Cro-Magnon ancestors were. If this is the case, then they are a separate species at the end, with no mixing between us, and should be called Homo neanderthalis.

The other option is that they disappeared through sex. Or rather, that they are still with us. We interbred with them to such an extent that their genes merged with us, and traces of Neanderthals still remain in modern humans. In which case they would be a subspecies, and properly called Homo sapiens neanderthalis. Of course, this wouldn't exclude the possibility of Homo sapiens sapiens (us) killing off large portions of them as well. And in either scenario, we once were of the same stock- the species concept is somewhat arbitrary, as it is always in a state of evolving flux. We can only say that if an animal can't, or doesn't, interbreed with another animal, it is of a different species. (Higher taxa are determined in a far more general manner, losing even this minimal definitiveness.)

This study indicates that the killing option was more likely. If the last time our genes were the same was 330,000 years ago, this was a long time after we diverged as modern humans, 130,000 years ago. Therefore we weren't around to interbreed with the Neanderthals at the time our DNA indicates similarities. However, other recent studies of the DNA of the very same bones indicate great similarites between the two lines, indicating continued sexual activity between the two groups.

The data is therefore still indeterminative at this point. However, the earlier study indicating sex between the two parties used a method that some say results in incomplete results mixed with intrusive DNA. This same analysis suggests that the difference between human and Neanderthal DNA will show to be less than that between the highly diverse African human populations. I'm personally rooting for the sex option, and I still have hope that it becomes the final conclusion. Probably a big part of this is my natural liberal bias- "Make love, not war" and all. Just a much more romantic notion to think that they disappeared that way, rather than us committing, however inadvertedly, the first and greatest mass genocide of our species. It doesn't help that the ones possibly committing this were my European ancestors.

But there are other reasons to hope for this. We know that Neanderthals had tools, cared for their injured, made art, abstract thinking, and probably buried their dead. This means something pretty far advanced. And however one determines the presence of the soul, life after death seems to be a big part of that, as it indicates the presence of a belief in the afterlife, and therefore some sort of religious belief.

Even more so, Neanderthal brain cases were larger than our own. They were also larger in body, and their brains were structured differently than ours- but there is the possibility that they were actually smarter. Solid evidence indeed that a bigger brain is not necessarily a selective advantage. I'd hate to lose out on all of that brain, culture, and heritage, wasted away, without a memory or a presence. Better to hope, however indefinite the evidence is at the moment, that there is a bit of Neanderthal in me, and you. Better to take the opportunity to glory in the compliment of intelligence, the next time somebody calls you a Neanderthal.
This is the discussion of the World Science updates as they become available.
Your thoughts are most welcome here.