Neil: Many people think that the laws of nature and the universe tell us that everything breaks down. Things fall apart. Energy wanes. Living things grow old and die. Yes, we have some good laws which explain all that, but what about the emergence of life? What about the complexity of life? Where do they come from? Are these rare miraculous developments or is this kind of complexity inevitable following natural laws we just haven't figured out yet. Correspondent Carla Wohl went looking for the answer.
Carla Wohl: It is mysterious how a flock of birds or a school of fish move as one with such grace and coordination as if there's one brain behind them all or an invisible force at play. An explanation may be found in emergence a science that tries to explain complex patterns and behavior that arise in the world around us. Some believe emergence may reveal more than just how birds and fish do this, but how we think and how life itself began in the first place, but while many of sciences mysteries long have been explained. Gravity we predict with Newton's Laws of Gravity and magnetism through Maxwell's Laws. Things like this remain largely unpredictable.
John Holland: Emergence when you first see it seems mysterious, but if I go back and read the papers at the time of Maxwell electromagnetism seemed very mysterious too.
Carla Wohl: Let's start with what we do know about emergence. It's an order we might not expect to see. Usually where there is order there is a leader, a conductor or an orchestra [00:02:00] or a general with his army. Orders come from the top and ...
John Holland: ... they go down.
Keith Still: Top down order where you have one brain controlling the functions of the entire group.
Carla Wohl: A leader at the top and many who follow down below. It's just how we expect things to be so who's in charge here. Him? No. Him? Uh-uh.
John Holland: There is no conductor, there is no general.
Robert Hazen: There is no leader. There is no director that's telling every fish where to go.
Carla Wohl: Well then what about these birds?
Keith Still: There's no one in charge of the birds either.
Carla Wohl: If the order isn't coming from the top down where is it coming from?
John Holland: The organization comes from the bottom up. At the bottom we have these things that are following their own sets of rules often fairly simple. One is to go in the same direction as the other guys. Another is don't get too close, but don't get too far from my neighbors.
Carla Wohl: And perhaps the most important rule. If someone's coming after you get out of the way. From these simple rules very complex patterns can spontaneously emerge.
John Holland: What we see is a pattern emerging from the bottom up.
Carla Wohl: It came to be called emergent complexity or simply emergence. Of course different creatures have different rules, but whether ants or wildebeests or this slime mold.
John Holland: The behavior emerges from the actions that are controlled by the rules and behavior of the whole is more than the sum of the parts and that's the flag for emergence.
Carla Wohl: And you might not have noticed yet, but it's not just seen in animals.
Keith Still: Similarly with crowds. There are no leaders within certain types of crowds.
Carla Wohl: Crowds of people? We do it just like the birds and fish.
Keith Still: Movement [00:04:00] is happening at a very much subconscious level. You don't think about how to walk you just do it.
Carla Wohl: Keith still studies the emerging complexity in crowds. He says these people crossing the street have no idea they're part of a larger pattern.
Keith Still: As if they're following each other in a long conga line. What happens is that the first individual that finds a gap is being followed by those people that find it easier to follow something that's moving in roughly the right direction than it is to carve their own path through the crowd.
Carla Wohl: Emergence happens with all kinds of living things that move in groups.
Keith Still: It can be a crowd, it can be a flock of birds, a school of fish. These are all emergent phenomenon when you're getting a large scale order out of a small scale interaction.
Carla Wohl: But emergent complexity can be found in nonliving things as well.
John Holland: Anything I know that exhibits emergence involves a lot of we might call them agents. A lot of individuals or parts we could call them parts.
Carla Wohl: John Holland's first experience with emergence came from some fairly unsophisticated electronic parts that came together to create something almost intelligent and he saw it a half century ago with a game of checkers. You used to look at this as child's play right?
John Holland: Yes I did.
Carla Wohl: I believe it's your move [inaudible 00:05:22]
John Holland: Oh all right.
Carla Wohl: What changed your mind?
John Holland: What changed my mind was my encounter at IBM this was in the early '50's. I was busy at that time simulating neural networks.
Carla Wohl: Meanwhile a co-worker Arthur Samuel was doing something else.
John Holland: He programmed the machine to play checkers and I thought well what he's doing is interesting, but that isn't anywhere near as deep as simulating neurons.
Carla Wohl: It's checkers right?
John Holland: Yeah it's checkers.
Carla Wohl: As it turned out Samuel had achieved something far deeper than anyone at IBM expected.
John Holland: He programmed the rules and the machine [00:06:00] would move according to the rules.
Carla Wohl: Not only was the computer following the basic rules of checkers it had another set of rules as well. A strategy to favor moves that might lead to victory.
John Holland: Simply by it's experience with him and other players it favored better moves than he did. That machine learned well enough that it could actually beat Samuel himself. With this learning I have emergence.
Carla Wohl: It was emergent because when the computer followed simple rules something as unpredictable and complex as learning emerged. Something until then only living things could do. Fifty years later computers really don't seem to have come all that far.
A Space Odyssey: "Good evening Dave." "How you doing Hal?"
Carla Wohl: 2001 has come and gone.
A Space Odyssey: "I've wondered whether you might be having some second thoughts about the mission."
Carla Wohl: Computers were supposed to be having conversations with us, thinking for themselves, so why can't they. Holland says that's because there's another important factor in emergence to consider. Complexity depends on how connected the parts are to each other.
John Holland: Compare the central nervous system our brain to a computer.
Speaker 8: There's a major difference. Each element in a computer, each transistor contacts at most 10 other elements, but in the human brain each individual neuron contacts 10,000 other neurons.
Carla Wohl: The sheer number of neurons in our brain as well as the number of connections between them is what makes our brain so much more complex than a computer.
John Holland: I've got billions of neurons and each one touching 10,000 others so we get the emergence and maybe some of us believe that consciousness is one of the emergent phenomena here.
Carla Wohl: Consciousness? Could something so complex spontaneously emerge from individual parts following simple rules? It may seem counterintuitive. Many of us think that without a leader or a [00:08:00] plan things become more disordered with time.
Robert Hazen: Our intuition about the world is that things deteriorate. We get old. We die.
Carla Wohl: Buildings crumble. We expect decay.
Speaker 9: This is the increase that's inevitable in the universe of disorder.
Carla Wohl: If order can emerge from disorder could we actually expect to see something as complex as life itself emerge?
Robert Hazen: Many of us believe that life follows inevitably as another emergent complex phenomenon.
Carla Wohl: Bob Hazen, an astrobiologist with the Carnegie Institution is trying to find out if life on earth emerged from simple molecules arranging themselves into something living. Hazen hypothesizes that the right molecules under the right conditions will do this, form increasingly more complex structures and those complex structures will form even more complex structures and so on until finally you get life. To start he needed a simple molecule. He choose pyruvic acid
Robert Hazen: Pyruvic acid is a good proxy for the kind of simple molecule that would have been abundant on the early earth. It's colorless. It's basically odorless and when you load it into a gold tube it's like threading a needle. You then seal this up.
Carla Wohl: Hazen is trying to reproduce the energy of the heat and pressure deep within the earth.
Robert Hazen: Typical of conditions that might occur in volcanic zones on the floor of the ocean. Seal this up.
Carla Wohl: He pressurizes and heats the capsules to 250 degrees centigrade.
Robert Hazen: It's like a pressure cooker. Emergent complexity takes place in any environment where you have lots of agents coming together, molecules coming together, and energy.
Carla Wohl: In a week's time [00:10:00] he's recreated the heat and pressure. The one thing missing is water.
Robert Hazen: That's the magic trick. Put it in water and bingo. Those molecules self organize into an enclosure cell like structure that's called vesicles. A structure which is essential for life.
Carla Wohl: Here the agents are molecules. The rules are the rules of chemistry. What emerges is one step closer to something biological. An important first step towards life.
Robert Hazen: The origin of life must have been a sequence of emergent steps from simplicity to complexity. You go from the simplicity of volcanic gases like carbon dioxide and water to organic molecules.
Carla Wohl: Still a vesicle needs to capture energy and nutrients to grow, replicate and divide before it can truly be a living thing and whether these steps are emergent is for Bob Hazen the great mystery to be solved.
Robert Hazen: This whole concept of emergent complexity gives us a whole new way of thinking about the universe going from simplicity of the earliest universe to the complexity of the modern living world.
John Holland: Even Hawking says complexity is the study of the 21st Century. Maybe in 20 years it will be the standard science for all I know.
Robert Hazen: Scientists would love to quantify emergent complexity. We'd love to be able to have a formula that told us what systems become complex, how complex they become.
John Holland: My guess is that we will find some laws that will let us describe some things in these complex adaptive systems. Patterns that we can recognize and maybe even make predictions about and that's the great advantage of Newton, of Maxwell, and maybe some day we'll get our own Maxwell.
Nova Now: For centuries, flocking confounded ornithologists ... It wasn't until 1986 that computer scientist Craig Reynolds programmed basic rule of bird motion into a computer [00:12:00] and the solution simply emerged. For his pioneering work, he received an Oscar for Science and Engineering.
NOVA_scienceNOW_Emergence / Page of