Sedimentology on Mars: wet or dry gravity flows?

Once again, the ‘water on Mars’ subject made it to the headlines: researchers claim that recent gully activity that took place in the last few years (as documented by photographs taken in 1999 and 2005) suggests that watery sediment flows (debris flows) are shaping the planet’s surface as we speak.

The problem is, of course, that it is difficult to keep water liquid in an environment where the temperature is usually way below 0 degrees Celsius and the atmospheric water vapor pressure is also very low. And, as far as I am concerned, the morphology of the gullies and of the associated deposits does not rule out deposition from dry granular flows at all. Of course, several papers have been written on the subject; here is, for example, an opinion from Allan Treiman (2003):

The salient features of the Martian gullies [Malin and Edgett, 2000, 2001] are consistent with their origin as dry flows of eolian sediment: gully deposits are fine granular material (erodable by wind); eolian sediment are available where gullies form; the distribution of gullies are consistent with deposition of sediment from wind; and the orientations of gullies are similarly consistent with wind patterns. Further, it is clear that granular materials can flow as if they were Bingham liquids, and granular flows can produce landforms with all of the geomorphic features of Martian gullies. No known data concerning the gullies (chronological, geomorphic, or geologic) falsify this hypothesis, so it is worth further investigation.

I just find it interesting that, by the time the story reaches the media, all the uncertainties disappear, and the story is unequivocal: watery flows must occur on Mars today, period.

John McPhee on geological language

Started reading John McPhee’s tetralogue on geology, Annals of the Former World. Here is a memorable sampling of the thick sediments of geological language (p. 33):

As years went by, such verbal deposits would thicken. Someone developed enough effrontery to call a piece of our earth an epieugeosyncline. There were those who said interfluve when they meant between two streams, and a perfectly good word like mesopotamian would do. A cactolith, according to the American Geological Institute’s Glossary of Geology and Related Sciences, was a “quasi-horizontal chonolith composed of anastomosing ductoliths, whose distal ends curl like a harpolith, thin like a sphenolith, or bulge discordantly like an akmolith or ethmolith.” The same class of people who called one rock serpentine called another jacupirangite. Clinoptilolite, eclogite, migmatite, tincalconite, szaibelyite, pumpellyite. Meyerhofferite. The same class of people who called one rock paracelsian called another despujolsite. Metakirchheimerite, phlogopite, ktzenbuckelite, mboziite, noselite, neighborite, samsonite, pigeonite, muskoxite, pabstite, aenigmatite. Joesmithite.

He could have included turbidite, tsunamite, tempestite, unifite, homogenite, debrite, hyperpycnite, and contourite as well. As if this wasn’t enough, there are sedimentary geologists who suggest introducing new ‘ites’ (PDF link) like gravite and densite.

Bullshite.

Bedforms in Matlab – everything you wanted to know about ripple marks and cross beds

David Rubin’s bedform-generating code has been implemented in Matlab (in fact, it has been out there for a while). It is a great learning, teaching, and research tool that can be downloaded as part of an USGS open file report. Strongly recommended to anyone having some interest in sedimentary structures, bedforms, and cool Matlab graphics.

That reminds me of something else: it would be nice to have a Matlab version running on Intel Macs. I hope Mathworks will keep its promises and have something ready by early 2007. Having to reboot the iMac in Windows XP is an acceptable solution, but I could live without it [although even Windows XP looks OK on this kind of hardware 🙂 ].

Let a thousand academic flowers bloom

The ongoing debate about whether there is need for a new university in Cluj that would roughly correspond to the former Bolyai University should consider what we know about higher education systems that work pretty well. Here are, for example, some recommendations from The Economist:

As it happens, we already possess a successful model of how to organise higher education: America’s. That country has almost a monopoly on the world’s best universities (see table 1), but also provides access to higher education for the bulk of those who deserve it. The success of American higher education is not just a result of money (though that helps); it is the result of organisation. American universities are much less dependent on the state than are their competitors abroad. They derive their income from a wide variety of sources, from fee-paying students to nostalgic alumni, from hard-headed businessmen to generous philanthropists. And they come in a wide variety of shapes and sizes, from Princeton and Yale to Kalamazoo community college.

This survey will offer two pieces of advice for countries that are trying to create successful higher-education systems, be they newcomers such as India and China or failed old hands such as Germany and Italy. First: diversify your sources of income. The bargain with the state has turned out to be a pact with the devil. Second: let a thousand academic flowers bloom. Universities, including for-profit ones, should have to compete for customers. A sophisticated economy needs a wide variety of universities pursuing a wide variety of missions. These two principles reinforce each other: the more that the state’s role contracts, the more educational variety will flourish.

I especially like that “a sophisticated economy needs a wide variety of universities pursuing a wide variety of missions”. Contrast that with what is going on in Romania. Cluj, the most important cultural center in Transylvania, is almost entirely dominated by a single but huge academic institution, that is, Babes-Bolyai University. There are about 45,500 students at UBB, and it is essentially the only institution in Transylvania that has some real scientific output (that is, publications in ISI journals). Not a lot of scientific output, taking into account the number of faculty, but certainly light-years ahead of any other place pretending to produce science.

So wouldn’t it make sense to diversify a bit the academic picture and re-create an institution that already has some respectable history? The new Bolyai University would not be an institution against the present-day UBB; and it clearly should not be solely focused on local and Hungarian issues. Ideally, it would result in a healthy competition, and it would give a chance to the Hungarian community in Transylvania to have a real center of excellence in research and higher education.

That would be the real multiculturalism. A relatively small but quality-driven institution of higher education is better than a giant degree-machine whose leaders seem to think that just pointing out how many thousands of students study in how many different languages shows how good the institution is. The best universities in the world are famous not for the sheer numbers of their students or faculty, and the number of languages that are used on campus, but for the quality and impact of research and teaching. And by that standard, I am sorry to say, Babes-Bolyai has a long way to go.

Digital Earth

Last weekend I discovered (1) that Google Earth was even more amazing than I had previously thought [and now they have a Mac version as well!]; and (2) there is a lot more out there in terms of digital geography if you look a bit harder.

Here is for example this USGS site from which you can download (with some patience) not only the usual satellite imagery but digital elevation models (DEMs) as well, for pretty much the whole globe [thanks to my friend Radu Girabcea for pointing me to it]. Once you’ve got a DEM, you can use 3dem, a nice little piece of freeware to display the elevation models in 2D and 3D and to drape georeferenced images over the topography. DEMs are available (for free — at least at this point) with a ~10 m resolution for most of the US and a ~30 m resolution for other areas (I was especially excited to savor the detailed topography of the Carpathians — the more familiar you are with a place, the more illuminating it can be if you examine the morphology).

Another thing worth taking a look at is NASA’s version of Google Earth, that is, World Wind. With one click, you can switch from Landsat images to USGS topographic maps [although I often have problems with the server connection]. Can it get a lot better than this?

The culture of science

[this article was published in Ad Astra in 2004]

An interview grabbed my attention in a Romanian newspaper a few months ago. A “researcher” claimed that, in his book entitled “The Final Truth”, he presented a theory that “bridges the gaps between the idealistic, materialistic and ezoteric worldviews”; that thoughts cannot arise in the human brain, they must come from somewhere else; that Darwininan evolution is wrong; that there must be another Universe that “consists of electromagnetic waves of higher frequencies”; and that this high-frequency Universe is the source of all human thought, UFOs, religion, astrology and paranormal phenomena.

The fact that somebody, who by all means would satisfy most criteria for the recognition of a crackpot, comes up with a handful of ideas that are either age-old or simply silly and tries to sell them as revolutionary scientific results is not new and would not grab my attention anymore. It was the style of presentation that forced me to think about this article a bit longer: the editor (and interviewer) tried to create an aura of scientific authenticity by saying that people from Chalmers University in Goteborg, Sweden and the Hungarian Academy of Science “expressed interest” in the book; and by mentioning that the author has spent many years doing research on these subjects in Sweden. I could not resist writing a letter to the newspaper and pointing out that the “research” of this gentleman is far from being science and, if presented at all, it should be presented accordingly, either as metaphysics or philosophy (of the sloppiest kind, I must add), or as just another muddled rambling about other-worldly energies and paranormal nonsense. But not as science and a Nobel-prize-worthy intellectual achievement.

The letter was published, and it generated a series of pro-and-con articles in the Transylvanian newspaper. With the exception of a mathematician, who was slightly critical of “The Final Truth” and its author, everybody, including the editor, were enthusiastic about them. They either said that this was science, my opinion nonwithstanding, or that this was more than science, because it integrates the ‘spiritual dimension’ with what we know from science. Those who argued against my criticisms included a ‘chief psychiatrist’ and a ‘university professor’. After a few months of replies-to-the-replies, the editor finally closed the argument by writing that he was proud of starting these series of articles about “The Final Truth”, and the importance of the book was also suggested by the fact that it drew the attention of “American researchers” as well. He just forgot to mention what the “American researchers” had to say about it.

It is true that the newspaper I am talking about is not a major paper in Romania; that it is published in Hungarian, therefore it has a relatively small readership in Transylvania, more precisely in the city of Cluj. I think however that it is diagnostic of the attitudes towards science in this part of Europe. After all, Cluj has one of the largest universities in Europe (more than 40,000 students and 1500 faculty), and I find it worrysome that nobody of the several thousand Hungarian-speaking faculty members and students takes the time to fight such science-bashing or science-degrading nonsense that surfaces from time to time in the media. They either don’t know how to tell good science from bad science or pseudoscience, or they do know but they couldn’t care less.

It seems to me that back home, science, if the word is understood correctly – as we saw, sometimes it isn’t -, is not considered an essential part of being well-read, well-informed, and well-educated. A lot of ‘intellectuals’ are enthusiastic about science – as long as astrology or chinese medicine are included, as long as great scientists can be used as boosters of national pride, or as long as you do not exclude postmodern literary criticism (the term “literature science”is often used in Hungarian and it gives a hint of how broad the meaning of the word ‘science’ is in some circles). When I was in high school in a small Transylvanian town near Brasov, math and physics were thought to be important only because at that time (in the eighties) these subjects meant the safest route towards college education. Almost everybody seemed to know that real knowledge and real culture can only come from the study of literature, art and history. And I think this attitude did not change since then, or it even got worse: it is still OK if you don’t know what a fractal is or how the genetic machinery inside us works, but you cannot be a real intellectual if you cannot talk about Shakespeare, Ionesco, Derrida or Tarkovsky for at least as long as two beers last at the pub. In their excellent paper on the status of science in post-communist Romania, Liviu Giosan and Tudor Oprea suggest that “culture wars” between the “two cultures” would be “suicidal at best”. However, I am afraid that there is no danger of “culture wars” or “science wars” in Romania, simply because the intellectual elite is dominated by people with little or no scientific background and a ‘culture of science’ does not exist. One obvious piece of evidence is that none of the major Romanian daily newspapers has a science and/or technology section. While ‘science writing’ has become an exciting profession in the West, it is essentially non-existent in Romania. Yes, Discovery Channel is available in many cities [let’s put aside now the fact that not all of its programs are scientific] and I hear there is even a Romanian edition of Scientific American, but, to put it mildly, there is a lot of room for improvement in making science more socially accepted, better understood, and part of mainstream culture.

More reliable than my little pieces of anecdotic evidence are the results of a recent study prepared for the European Commision: an Eurobarometer report on “public opinion in the countries applying for European Union membership”. There are several statistics that suggest a positive attitude towards science in the candidate countries in general, including Romania. For instance, 78 % of Romanians (81 % on average in the thirteen countries) agree with the statement that “science and technology are making our lives healthier, easier and more comfortable”. Also, 74 % think that “even if it brings no immediate benefits, scientific research which adds to knowledge, is necessary and should be supported by government”, and scientists are regarded by 51 % of the respondents as having a highly prestigious profession. Other numbers however are less encouraging. In the category of “knowledge of fundamental scientific facts”, the average number of correct answers given by participants in Romania is significantly below the average in the EU or in many other Eastern European countries. Compared to the rest, Romanians did poorly in in recognizing the scientifically correct method for drug testing (15 % correct answers compared to more than 30% in most other countries).

I am not convinced that these differences are extremely important or disconcerting. The gaps between statistics on science in Romania and in other candidate countries or the EU increase from barely significant to orders of magnitude as one goes from the attitudes and knowledge among the population to governmental investments in R&D and to the number of scientific publications. To add only one number to the detailed analysis by Giosan and Oprea (2003): the gross domestic expenditure on R&D in the field of natural sciences in 2000 was 12.1 million euros in Romania, compared to 59.1 million in Hungary, 185.9 million in the Czech Republic, and 261.9 million in Poland (Simona Frank: R&D expenditure and personnel in the candidate countries in 2000, Statistics in focus, Science and technology, Theme 9-1/2003).

But my main concern here is not science policies, R&D expenditure, or the quantity and quality of research in Romania. What I wanted to and started to talk about is the lack of a culture of science in the mass media and among intellectuals in general, including even many of those who are employed by universities or research institutes.
Science has become much more popular and fashionable in the West during recent decades. Numerous science books written for the general public in a simple and easy-to-understand language – but without too much dumbing down – are bestsellers; it is possible now to make a succesful Hollywood movie about the life of a mathematician (I am talking about ‘A Beautiful Mind’); most large bookstores have an impressive collection of popular science books. Some of these books are much more than popular science: they are frequently cited in the real scientific literature and have a strong influence on the field; many represent an inspired – and inspiring – mix of scholarship in the natural sciences, philosophy, and good writing. Authors like Richard Dawkins, Stephen Jay Gould, Steven Pinker, Daniel Dennett, Steven Weinberg have become a lot more popular than numerous highly regarded names in postmodern literary criticism and philosophy. [Frankly, I am not surprised. Try reading an essay or a book by one of the science guys and compare it to a representative writing of the of the postmodernist camp.] Museums of science, technology and natural history in the United States are larger, richer, and more interactive than ever. Whenever a famous scientist gives a public presentation, lecture halls are quickly filled and tickets are sold out in advance. A few months ago Stephen Hawking gave a lecture in Houston. All of the almost 5000 tickets that went on sale were gone by the time of the presentation.

It seems like the two cultures of C. P. Snow are antagonistic or lack real communication only in the eyes of those who still see the arts and the social sciences entirely independent of the natural sciences. The best and some of the most influential thinkers of our time are scientists who are also good writers – or writers/artists who know quite a bit about science. This ‘culture of science’ has been given the name “third culture” by literary agent and science writer John Brockman and is promoted on his website “The Edge” (http://www.edge.org), a discussion forum for a distinguished group of scientists and ‘new humanists’. Twelve years after introducing the idea of the ‘third culture’, Brockman suggests that “the third culture now includes scholars in the humanities who think the way the scientists do. Like their colleagues in the sciences, they believe there is a real world and their job is to understand it and explain it. They test their ideas in terms of logical coherence, explanatory power, conformity with empirical facts. (…) They are not reducing the humanities to biological and physical principles, but they do believe that art, literature, history, politics – a whole panoply of humanist concerns – need to take the sciences into account.”

As I already suggested, I do not think that the ‘third culture’ and the ‘new humanists’ have a strong presence in Romania. Most people base their worldviews entirely on tradition and authority or embrace either the numerous new waves of mysticism and pseudoscience or a nihilistic and relativistic postmodernism. Although not everything is going well in this regard in the Western world either, I still hope that getting closer politically and economically to the European Union will increase not only the quantity and quality of research in Romania, but will also improve science education and the acceptance and understanding of science.

Like in other, more western parts of the world, most people in Romania seem to have an overall positive attitude toward science. They just don’t know what exactly it is. Those few who know better have the responsibility of educating the general public. For example, by speaking out when pseudeoscientific or antiscientific nonsense hits the media; explaining in simple terms but with convincing logic why pseudoscience is not science or why darwinism and evolutionary theory cannot and should not be blamed for the horrors of fascism and communism. It is unlikely that a country will have its Silicon Valleys and a greatly succesful economy as long as its political leaders and influential intellectuals do not recognize the importance and value of both scientific research and science education. In the long term, they should also realize that the social sciences and humanities cannot ignore the natural sciences anymore. As evolutionary biologist Edward O. Wilson put it, “most of the issues that vex humanity daily – ethnic conflict, arms escalation, overpopulation, abortion, environment, endemic poverty, (…) cannot be solved without integrating knowledge from the natural sciences with that of the social sciences and humanities. Only fluency across the boundaries will provide a clear view of the world as it really is, not as seen through the lens of ideologies and religious dogmas or commanded by myopic response to immediate need.”

References

1. L. Giosan and T. Oprea. Science in post-communist Romania. Ad Astra, 1 (2) 2002.
2. Candidate countries Eurobarometer. Public opinion in the countries applying for European Union membership. CC-EB 2002.3 on science an technology. European Commission, January 2003.
3. S. Frank. R&D expenditure and personnel in the candidate countries, in 2000, Statistics in focus, Science and technology, Theme 9-1/2003.
4. C. P. Snow. The two cultures. Cambridge University Press, 1993.
5. E. O. Wilson. Consilience: the unity of knowledge. Vintage Books, 1999.

Global warming does not cause earthquakes

According to Wired magazine’s “Biggest Discoveries of 2005“, the most important discovery of 2005 is that

Thanks to the Asian tsunami and Hurricane Katrina, global warming can no longer be ignored.

I agree that global warming can no longer be ignored, but you don’t need to know too much about earth science to realize that the Asian tsunami has absolutely nothing to do with it.

The truth about the Enlightenment

An excellent article by philosopher Simon Blackburn. It is great to hear somebody talk like this after all the noise about the coming apocalypse, the anti-humanism of science, the dangers of technology, and so on:

“The west, it is sadly said, has lost confidence in the Enlightenment. It is quite common to see intellectuals state as a fact that the Enlightenment project has been tried and failed. This is a lie. There never was one single Enlightenment project, and of the Enlightenment projects that there were, many have succeeded beyond the wildest hopes of their proponents. The Enlightenment provided the matrix I have talked of, in which scientific enterprises could flourish. Now, our understanding of the world is better because of physical science. Our understanding of ourselves is better because of biological science. We live longer, and we feed ourselves better, and ‘we’ here includes not only people in first world countries, but countless people in the third world. We look after the environment better, and in time we will manage our own numbers better. Outside the theocracies of the east more people have more freedoms and enjoy more education, more opportunities and may even have more rights than ever before. We owe this progress entirely to the culture forged, in the west, by Bacon and Locke, Hume and Voltaire, Newton and Darwin. Humanism is the belief that humanity need not be ashamed of itself, and these are its great examples. They show us that we need not regard knowledge as impious, or ignorance as desirable, and we need not see blind faith as anything other than blind.”