Magicians reveal what the world's all about

For several years, I've been fascinated by the popular books of three physicists: Brian Greene, David Deutsch and Lawrence Krauss.

Funnily enough, although the three of them are writing about the same general subject—our state-of-the-art understanding of the nature of the universe—they rarely, if ever, get around to handling the same questions in comparable, if not similar, fashions. Moreover, in their latest books, they hardly even refer to one another's work.

It's easy to understand superficially why Greene, Deutsch and Krauss don't seem to have a lot to say to one another. Greene has been reputed for a long time as an adept of string theory, and there's no reason to imagine that the other two physicists are particularly keen on this theory. Earlier this year, Krauss became widely known through his presentation of an esoteric explanation of how the ultimate "free lunch"—obtaining something from nothingness—is a perfectly plausible phenomenon at a cosmic level.

As for the 59-year-old Oxfordian David Deutsch, he comes through to me as the most philosophical member of the trio. Indeed, he offers us a multiverse view of existence that is totally amazing. As in his first book, The Fabric of Reality, Deutsch pursues in The Beginning of Infinity his quest for a Theory of Everything inspired by the work of a somewhat heteroclite foursome: Karl Popper (epistemology), Hugh Everett (multiverse theory), Alan Turing (computation) and Richard Dawkins (evolution). Indeed, between the Popperian explanations of knowledge, the connotations of quantum theory leading to the existence of multiple universes, the vast theories of classical computing put forward by Turing (which are no doubt sufficient to handle, not only the DNA computer responsible for replication and life, but also the phenomena of neuronal computing) and finally the processes of Darwinian evolution and genetics so brilliantly presented by Dawkins, most observers would agree that we've no doubt covered many of the basic essentials of a scientific outlook on reality. Deutsch himself refers to these four grand dimensions of his global philosophical approach as strands (a word I like, which evokes weaving a fabric).

A few weeks ago, I was excited to learn that Deutsch has been working on a kind of fifth strand, of a subterranean nature, which he calls constructor theory. If you've got 47 minutes of free time, I urge you to click here to listen to Deutsch himself presenting this work. Basically, it's a matter of trying to understand why certain things are possible (even though they may have never actually happened yet) whereas countless other potential events are impossible because certain laws of physics have "blacklisted" them forever. In other words, he has enhanced astronomically the sense of the concept of possibility, to the point of claiming that anything and everything is strictly possible... provided only that we know of no law of physics that forbids such a happening, and therefore renders it impossible. Deutsch draw our attention to the strict binarity of the situation. Between the impossible (ruled out by physics) and the possible, there is no third way out. On the one hand, nothing—not even the most extravagant events—should be branded as theoretically impossible unless we are already aware of a law of physics that forbids such things. On the other hand, everything else should be thought of as theoretically possible.

In his eagerness to point out the counterintuitive nature of this thinking, Deutsch hit upon an amusing easy-to-grasp example, which goes straight to the heart of my Antipodes blog. Most of us agree that people on the other side of the planet Earth are in an upside-down position with respect to us, and vice versa.

That old Epinal image is funny but quite silly, of course, because nobody really believes that Antipodeans get around on their hands, with their Hobbit-like feet stretching towards the heavens. But are we truly ready to admit that the heads of Antipodeans point constantly in the opposite direction to our own heads? If technology were to offer me a magical real-time closeup view of Antipodeans, in strict conformity with our mutual orientations, in the same way that binoculars enable me to observe distant objects through my bedroom window, would I not be somewhat surprised to receive upskirt images of Antipodean ladies whose heads appear to be receding upwards into the sky? My surprise (which would be inevitable, I think) would seem to confirm that, to a certain extent, I've never really believed wholeheartedly that the heads of Antipodeans point in the opposite direction to mine. And David Deutsch considers that this mild form of surprise, or doubt, reflects my persistent quest for a third way out, between the possible and the impossible. My scientific culture persuades me that there is no law of physics that would forbid Antipodeans from getting around in an upside-down position with respect to me. So, I conclude that it's perfectly possible for this to be the case. At the same time, I consider that modern laws of celestial mechanics have quashed forever all remnants of flat-Earth theories, meaning that it's unthinkable that the heads of Antipodeans might point in the same direction as mine. And yet I don't seem to have gone one tiny step further and admitted explicitly, in a tangible concrete sense, that people down on the opposite side of the planet are truly presenting me constantly (if only the Earth were transparent) with an upskirt vision of their environment.

What David Deutsch seems to be saying (in a roundabout fashion) is that we would do well to consider, in an equally tangible and concrete sense, that we exist within a multiverse where the quantum effects admitted by today's laws of physics must be thought of, not only as possible happenings, but as garden-variety aspects of the fabric of everyday reality. And I'm not sure that many of us are prepared, at present, to assimilate profoundly that weird mode of looking at existence. Between archaic fairy tales (often supported by so-called commonsense) and hard state-of-the-art science, we persist in hoping, if not believing, that there must surely be some kind of convenient "third way out".

Blue light in the darkness

I came across an article in the French press about an ingenious device that apparently prevents night-time drivers from falling asleep at the wheel. It's simply a blue LED lamp fixed inside the vehicle, in the vicinity of the rear-view mirror, so that it shines into the driver's eyes.

                                         — photo CNRS/Université Bordeaux Segalen

Researchers at the CNRS (French national scientific organization) and the university of Bordeaux explain that the blue light of their embedded anti-drowsiness device acts upon the driver's biological clock by inhibiting the secretion of the melatonin hormone, which is responsible for inducing drowsiness. [For an in-depth presentation of this hormone, look up melatonin in Wikipedia.] According to its inventors, tests of the blue-light technique demonstrate that it's more efficient than coffee in the prevention of drowsiness... which is the main cause of mortal accidents on French autoroutes (highways). They add nevertheless that 17 per cent of their subjects were unable to complete the tests because the blue lamp shining in their faces made it totally impossible for them to drive at all.

Everybody agrees nevertheless that it's preferable to sleep well during the week that precedes any night-time driving, and to pull over for a 15-minute nap as soon as the first signs of drowsiness appear. That explanation about the advantages of sleep as a remedy for drowsiness is a bit like saying that there's no better remedy for hunger than food.

The idea of a life-saving blue light in the darkness reminds me of one of the loveliest short videos I've ever seen, created by the US cosmologist and science author Carl Sagan [1934-1996].

Sagan's origins were Russian, and he started his prestigious career as a popularizer of science by coauthoring a book with the Soviet astrophysicist Iosef Shmuelovich Shklovskii [1916-1985], Intelligent Life in the Universe (1966).

This was in fact the first serious English-language book ever published on this exciting theme, and it fascinated me at the time, in the late 1960s. Unfortunately, it's the kind of book that has dated rapidly and considerably, and the writing style and didactic content hardly match up to the brilliance of today's great authors of popular books on physics such as Brian Greene (The Hidden Reality, 2011), David Deutsch (The Beginning of Infinity, 2011) and Lawrence Krauss (A Universe from Nothing, 2012). Often, when I'm reading, I underline fragments that have impressed me greatly. In the book by Shklovskii and Sagan, I notice that I underlined the following words: (on page 248):

For all our feelings of self-importance, we are only a kind of biological rust, clinging to the surface of our small planet, and weighing far less than the invisible air that surrounds us.

I realize that I've always been attracted to sentiments that downplay human vanity. Be that as it may, here's Sagan's video on the pale blue dot in the middle of the sky:

Talking of extraterrestrial creatures, I would imagine that most of my readers have met up with the marvelous short story by the US science-fiction writer Terry Bisson entitled They're made out of meat. You can find it on the web by clicking here. It's so short that I've taken the liberty of including a copy here:

THEY'RE MADE OUT OF MEAT

"They're made out of meat."

"Meat?"

"Meat. They're made out of meat."

"Meat?"

"There's no doubt about it. We picked up several from different parts of the planet, took them aboard our recon vessels, and probed them all the way through. They're completely meat."

"That's impossible. What about the radio signals? The messages to the stars?"

"They use the radio waves to talk, but the signals don't come from them. The signals come from machines."

"So who made the machines? That's who we want to contact."

"They made the machines. That's what I'm trying to tell you. Meat made the machines."

"That's ridiculous. How can meat make a machine? You're asking me to believe in sentient meat."

"I'm not asking you, I'm telling you. These creatures are the only sentient race in that sector and they're made out of meat."

"Maybe they're like the orfolei. You know, a carbon-based intelligence that goes through a meat stage."

"Nope. They're born meat and they die meat. We studied them for several of their life spans, which didn't take long. Do you have any idea what's the life span of meat?"

"Spare me. Okay, maybe they're only part meat. You know, like the weddilei. A meat head with an electron plasma brain inside."

"Nope. We thought of that, since they do have meat heads, like the weddilei. But I told you, we probed them. They're meat all the way through."

"No brain?"

"Oh, there's a brain all right. It's just that the brain is made out of meat! That's what I've been trying to tell you."

"So ... what does the thinking?"

"You're not understanding, are you? You're refusing to deal with what I'm telling you. The brain does the thinking. The meat."

"Thinking meat! You're asking me to believe in thinking meat!"

"Yes, thinking meat! Conscious meat! Loving meat. Dreaming meat. The meat is the whole deal!  Are you beginning to get the picture or do I have to start all over?"

"Omigod. You're serious then. They're made out of meat."

"Thank you. Finally. Yes. They are indeed made out of meat. And they've been trying to get in touch with us for almost a hundred of their years."

"Omigod. So what does this meat have in mind?"

"First it wants to talk to us. Then I imagine it wants to explore the Universe, contact other sentiences, swap ideas and information. The usual."

"We're supposed to talk to meat."

"That's the idea. That's the message they're sending out by radio. 'Hello. Anyone out there. Anybody home.' That sort of thing."

"They actually do talk, then. They use words, ideas, concepts?"

"Oh, yes. Except they do it with meat."

"I thought you just told me they used radio."

"They do, but what do you think is on the radio? Meat sounds. You know how when you slap or flap meat, it makes a noise? They talk by flapping their meat at each other. They can even sing by squirting air through their meat."

"Omigod. Singing meat. This is altogether too much. So what do you advise?"

"Officially or unofficially?"

"Both."

"Officially, we are required to contact, welcome and log in any and all sentient races or multibeings in this quadrant of the Universe, without prejudice, fear or favor. Unofficially, I advise that we erase the records and forget the whole thing."

"I was hoping you would say that."

"It seems harsh, but there is a limit. Do we really want to make contact with meat?"

"I agree one hundred percent. What's there to say? 'Hello, meat. How's it going?' But will this work? How many planets are we dealing with here?"

"Just one. They can travel to other planets in special meat containers, but they can't live on them. And being meat, they can only travel through C space. Which limits them to the speed of light and makes the possibility of their ever making contact pretty slim. Infinitesimal, in fact."

"So we just pretend there's no one home in the Universe."

"That's it."

"Cruel. But you said it yourself, who wants to meet meat? And the ones who have been aboard our vessels, the ones you probed? You're sure they won't remember?"

"They'll be considered crackpots if they do. We went into their heads and smoothed out their meat so that we're just a dream to them."

"A dream to meat! How strangely appropriate, that we should be meat's dream."

"And we marked the entire sector unoccupied."

"Good. Agreed, officially and unofficially. Case closed. Any others? Anyone interesting on that side of the galaxy?"

"Yes, a rather shy but sweet hydrogen core cluster intelligence in a class nine star in G445 zone. Was in contact two galactic rotations ago, wants to be friendly again."

"They always come around."

"And why not? Imagine how unbearably, how unutterably cold the Universe would be if one were all alone ..."

Good books

Britain's New Scientist weekly has just put out a selection of 25 popular science books that "have changed the world" [here].

I would have been a little worried if this list of books had included many works that I did not know. On the contrary, I was thrilled to discover that I had read 15 of their suggested titles, while most of the remaining titles rang a bell (in the sense that I had heard of them, and had a good idea of their themes). The only one of the 25 books that was a total newcomer to me was The Man Who Mistook his Wife for a Hat by Oliver Sacks (1985). Here are those that I've read:

•  A Brief History of Time by Stephen Hawking (1988)

•  Brighter Than a Thousand Suns by Robert Jungk (1956)

•  Godel, Escher, Bach by Douglas Hofstadter (1979)

•  Guns, Germs and Steel by Jared Diamond (1997)

•  On the Origin of Species by Charles Darwin (1859)

•  The Ascent of Man by Jacob Bronowski (1973)

•  The First Three Minutes by Steven Weinberg (1977)

•  The Language Instinct by Steven Pinker (1994)

•  The Selfish Gene by Richard Dawkins (1976)

•  Silent Spring by Rachel Carson (1962)

•  The Double Helix by James Watson (1968)

•  The Emperor's New Mind by Roger Penrose (1989)

•  The Mysterious Universe by James Jeans (1930)

•  The Naked Ape by Desmond Morris (1967)

•  What is Life? By Erwin Schrödinger (1944)

At the top of this list, the "big three" for me would be Dawkins, Watson and Pinker. I would have included a title by David Deutsch... but it's a fact that he remains a bit too recent to have changed the world yet. Maybe "will change the world". The same could be said of Lawrence Krauss.

Rivers never flow uphill

As a youth in my native Grafton, I didn't think of myself as somebody who might be particularly interested in the flow of rivers. That's because I happened to be living alongside the great Clarence River, which I used to see so regularly (usually from afar) that I finished by no longer noticing it. I had grown up in the aftermath of the tragic December 1943 drowning of 13 boys, junior (cub) members of the local troop of Boy Scouts. As a child of ten or so, I had witnessed the damage waged by the waters of the Clarence in a disastrous flood. Later, I rowed in school races (in "fours") in the shadow of the antique double-decker bridge, over which I used to ride my bicycle regularly.

To paraphrase the well-known forest/trees saying, I simply didn't see the river because of the water. Much later, in Paris, I learned that a river has a left bank and a right bank.

The common-sense adjectives "left" and "right" are so much more tangible, for people living alongside a great river, than the theoretical notions of north and south. So, I had passed my childhood in right-bank Waterview (South Grafton) before moving across to our new left-bank residence in Kent Street (Grafton).

Since arriving here at Choranche, on the edge of the French Alps, I've come to appreciate the sense of the adjectives upstream and downstream. The Bourne flows down from Villard-de-Lans.  Choranche is located on the right bank, and Châtelus on the left. And Pont-en-Royans is a little further downstream. It's a bit like seasons. Back in Australia, I hardly knew what they were all about. These days, at Gamone, they determine my daily existence.

There's another realm, of a theoretical kind, in which we must be aware of the direction of flow. I'm referring to the flow of information and scientific knowledge. Just as rivers never flow in an upstream direction, information and knowledge always flow in a unique direction: downwards from X to Y, say, but never upwards from Y to X.

This was one of the great lessons taught by Karl Popper when he demolished the time-honored but absurd notion that an understanding of the laws of the natural universe can be acquired miraculously when knowledge flows spontaneously, indeed magically, from the natural phenomena being examined by a researcher up into the scientist's mind. This mysterious process, referred to as induction, was a part of established science back in my student days. Since Popper, we realize that a new understanding of the ways in which various natural phenomena unfold can arise in the mind of a brilliant scientist. This knowledge then flows down into other human minds, enabling the newly-imagined explanations to be applied to the natural phenomena that inspired the creative scientist, for verification (best possible case) or for rejection (worst-case scenario).

Two centuries ago, in the domain of the evolution of living organisms, a great and ancient "river" of a physiological kind was thought of as capable, from time to time, of flowing uphill.

 Jean-Baptiste Lamarck considered that a living creature could transmit to its offspring various characteristics acquired during the parent's earthly existence. Take the case of a primitive giraffe, many millennia ago, at a time when giraffes still had relatively short necks, since they could find all the leaves they needed quite close to the ground. Let's suppose that a couple of giraffes were having a serious discussion about the idea of having a baby.

Mr Giraffe: There's only one thing that worries me, dear. Due to global warming, there's no longer any grass around. So, we're forced to eat leaves. But there are fewer and fewer leaves at a low level. Soon, to reach the high leaves and survive, giraffes will need to have longer and longer necks.

Mrs Giraffe: My dear husband, I agree with you entirely. But, if our future baby needs an exceptionally long neck to find food, then we must make sure that he's born with such a neck. There are no two ways about it.

Mr Giraffe: OK, but how can we make sure that his neck will be long enough for him to survive?

Mrs Giraffe: We must pray, my dear husband, and implore our Good Giraffe God to perform a miraculous intervention of genetic engineering.

So, that's what they did. And, soon after, biological information from the parched earth flowed up through the tree trunks, past the bare branches at the bottom of the trees, until it reached the level of the luscious greenery. And, from there, this precious information—dealing primarily with the complex procreative question of how to produce giraffe embryos with long necks—was consumed and digested by Mrs Giraffe… who suddenly felt a glowing long-necked warmth in her womb. The miracle was taking place!

We now know that Lamarckism was totally wrong, but it was never, at any stage, a completely crazy belief. Even today, when tourists halt for a moment alongside the lovely old thatched house in Pont-en-Royans [display], and chat with the village blacksmith and his son, they are invariably impressed by their giant strong hands, which have been  photographed in closeup on countless mobile phones.

Blacksmith: My ancestors have been blacksmiths here at Pont-en-Royans for countless generations, and the blacksmiths' sons and daughters have always married the offspring of other blacksmiths in neighboring villages. And the gnarled hands of our kids, today, reveal the traces of all those centuries of hard work at the forge.

Who could possibly doubt the truth of the good man's words? His strong hands have been shaped, over the centuries, by a mysterious process of divinely-ordained genetic engineering that seems to "understand" that future blacksmiths need to inherit the hands, not merely of their forefathers, but of their forefathers' trade! This knowledge has flowed up from the forge to the uterus of every young lady chosen to become the mother of a future blacksmith. It's all a bit like the Nazarene carpenter's wife, who had received knowledge informing her that she would be giving birth to the Lord.

The only flaw in these nice and convincing tales is that knowledge about a future offspring never needs to flow into an embryo, because the zygote formed from the pair of gametes provided by the parents of a future member of the blacksmith dynasty contains all the information that it is required to forge a new human being. And, if the baby blacksmith looks as if he has inherited gnarled hands, that merely means that at least one of his parents had gnarled hands. And that characteristic had nothing to do with their daily occupations. Even if the latest generations of the baby's ancestors had all decided to transform their ancient forges into tourist boutiques, they would still have been born with gnarled hands. Inheritance specifications never flow upwards from a blacksmith's forge to human parents and their babies. They are transmitted, through chromosomes, from parents down to their offspring. Rivers never flow uphill.

This metaphor of information flow applied both to Karl Popper's views on induction and to Lamarck's views on inheritance was developed at length by David Deutsch, of Oxford.

His article Selfish Genes and Information Flow appeared in the collection entitled Richard Dawkins, How a Scientist Changed the Way We Think, Oxford University Press, 2006.