earth science: getting to the core of the matter

Unless you’re a character in a Jules Verne novel, journeying to the center of the earth remains impossible. So researchers interested in understanding the still somewhat mysterious inner workings of our planet’s iron-rich core must obtain their information indirectly, for example, by measuring seismic waves traveling through the earth’s interior. But by replicating the intense pressures and temperatures found at the core in a lab, physicists Jeffrey H. Nguyen and Neil C. Holmes have now shed some light on how iron behaves deep inside the earth. In the January 22 Nature, the Lawrence Livermore National Laboratory researchers report subjecting a sample of iron to shockwaves generated by a gas gun, which creates pressures millions of times the pressure of air at the earth’s surface. From their experiments, the researchers discovered that iron at earth-core conditions melts at a temperature of about 8,720 degrees Fahrenheit. “By determining the melting point of iron, we can estimate the temperature at the core boundaries,” Nguyen stated in a press release. “This information provides us with another tool to study the temperature of the Earth’s core.”

This news brief appeared in the Discoveries column of the Boston Globe’s Health/Science section on 1/27/2004.
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psychology: monkeys fail hard grammar test

To the dismay of many would-be Dr. Dolittles who’d like nothing more than to talk to the animals, new research suggests that the ensuing conversation might not be particularly sparkling. Marc D. Hauser of Harvard University and W. Tecumseh Fitch of the University of St. Andrews in Scotland report in the Jan. 16 Science that they have found that cotton-top tamarin monkeys cannot understand the complicated rules of grammar that are key to human language. Though previous studies have shown that the monkeys could comprehend very simple grammatical rules, the researchers found once the words are no longer right next to each other, such as an “If . . . then . . .” sentence construction, the monkeys became perplexed. Hauser and Fitch first exposed the animals to recordings of both a simple and a more complicated grammatical pattern through a loudspeaker. Then the grammar rule for each example was occasionally broken. If a monkey looked at the loudspeaker when this happened, it was taken as evidence that it recognized the discrepancy. This capability, the authors write, “is one of the crucial requirements for mastering any human language.”

This news brief appeared in the Discoveries column of the Boston Globe’s Health/Science section on 1/20/2004.
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sports science: tennis players use math for net gains

Who knew? Your favorite tennis star may also be a master of Bayesian probability theory, according to a study in the Jan. 15 Nature. Konrad P. Kording and Daniel M. Wolpert of University College London report that the sort of visual and spatial judgments a good tennis player’s brain has to make when she or he returns a serve are based on mathematical principles formulated by Thomas Bayes over 200 years ago. (Bayesian theory, which concerns how outcomes are affected by prior knowledge, helped give rise to modern statistics.) The researchers tested people playing a computerized game that required them to point to where they thought a target sphere would land, similar to a tennis player having to judge an opponent’s shot. It appears that good players not only used information on what they saw around them, but also used judgments they had made about variations in the speed and trajectory of the ball from previous trials.

This news brief appeared in the Discoveries column of the Boston Globe’s Health/Science section on 1/20/2004.
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physics: opera singers really are hard to understand

Do you find opera perplexing? Grossly overweight consumptives notwithstanding, many people have trouble figuring out what the performers are actually singing, even when the opera is in their native language, hence the ubiquity of electronic subtitling in opera houses today. Australian physicists report in the Jan. 8 Nature that they’ve figured out why opera singers are hard to understand, at least for sopranos singing at the high end of their range. Singers wishing to be heard in a large auditorium against a loud orchestral accompaniment do so at the expense of vowel clarity, making their words unintelligible. Researchers from The University of New South Wales studied eight sopranos, measuring the resonance and pitch frequencies as they sang ascending scales. To produce the loudest and highest notes, singers adjust their vocal tracts, usually dropping their lower jaws and opening their mouths wide, making them distort their pronunciation. The distinction between words such as hard, heard, hoard and who’d, for example, can be easily lost. It appears that hitting high C’s also means losing your A, E, I, O, and U’s.

This news brief appeared in the Discoveries column of the Boston Globe’s Health/Science section on 1/13/2004.
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geometry: the science of skipping stones

A cool, calm lake. Your dog frolicking along the beach. Your significant other admiring your attempt to skip a stone across the water — and, to your deep embarrassment, it plops straight down with nary a bounce. Has this ever happened to you? Thanks to a new study, you need never suffer the humiliation of inadequate stone-skipping again. Christophe Clanet from the University of Aix-Marseille in France and his colleagues report in the Jan. 1 Nature that they have discovered the secret of maximizing the number of bounces in a skipped stone: you need to keep an angle of about 20 degrees between the spinning stone and the water’s surface. To obtain that magic number, the researchers built a stone-skipping machine that fired aluminum discs into a tank of water. Using high-speed video cameras, Clanet and his team monitored the discs as they hit the water at various angles, velocities, and spins, focusing on the “crucial moment” of the bounce. Though the speed and rotation of the object are important, the physicists found that the angle of collision between the object and the water was critical to obtaining the largest number of bounces. In fact, no rebound was possible if the angle was greater than 45 degrees. So, the next time you want to impress your partner with your stone-skipping prowess, bring a protractor.

This news brief appeared in the Discoveries column of the Boston Globe’s Health/Science section on 1/06/2004.
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astronomy: universe changed color over time

When most people think of the color of the universe, the black of its vast, inky depths probably comes to mind. If it were possible to view the average of all the visible light in the universe, the true color actually would be kind of beige — but it appears that the universe was a decidedly more colorful in its youth. An international team of researchers reported in the Dec. 20 Astrophysical Journal that the universe was bluer 11,500 million years ago when it was only 2,500 million years old, because of all the young stars. As they aged and turned redder, they tinted the universe. “Our new findings imply that the majority of stars in the universe were formed comparatively late, not so long before our sun was born, at a moment when the universe was around 7,000 million years old,” stated team leader Gregory Rudnick from the Max Planck Institute for Astrophysics in Germany.

This news brief appeared in the Discoveries column of the Boston Globe’s Health/Science section on 1/06/2003.
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build it tall

Why build tall? People have always built as high as existing technology would allow them. Whether to glorify kings, as in the pyramids of ancient Egypt, or to glorify God, as in the soaring cathedrals of medieval Europe, towering edifices are meant to be awe-inspiring. Even in today’s skyscrapers, which only glorify the corporations or cities that pay to erect them, there is still the same sense of grandeur and ego in the enormous scale of construction. Though praised by some as marvels of engineering and architectural beauty, icons of modernity and progress, these colossal structures are denounced by others as blights on the urban landscape, robbing cities of light and air, and, massed together to form towering canyons, helping to foster a sense of alienation and impersonality. Love ’em or leave ’em, skyscrapers today still define the modern city. But will they in the future?

Professor William J. Mitchell, former dean of MIT’s School of Architecture and Planning, argued in a 1997 Scientific American essay, “Do We Still Need Skyscrapers?” that the days of staggeringly tall towers may be numbered because they simply aren’t economical. In cities, downtown land is at a premium, so there is always the motivation to build as tall as possible, to get the most use out of the smallest parcel of land. Yet the higher you build, the greater proportion of each floor must be devoted to structure and to vertical circulation, and maintenance and operation costs rise as well. Mitchell argues that since computers and the internet now allow employees to work remotely, there’s no longer any need to centralize thousands of workers in monstrously-huge office buildings. Mitchell, speaking to reporters after the September 11 World Trade Center attack, gave security concerns as yet another argument against skyscrapers.

However, University of Illinois architecture professor Mir Ali, author of The Art of the Skyscraper, doesn’t believe the age of skyscrapers is over just yet. The world is rapidly becoming urbanized, as more and more people leave rural areas for the economic possibilities of the great cities. With a growing population, land is even more scarce and expensive, which may leave many nowhere to build but up.

This is especially evident in Asia, where the world’s tallest buildings can now be found, showcasing the ambitions and economic dynamism of the region. In 1990, the 50 tallest buildings were in the United States, but as of 2003, only two remain on the top ten. Just a few months ago, the Petronas Twin Towers in Kuala Lumpur held the official title as the world’s tallest, but with the erection of Taiwan’s Taipei 101 office block’s spire last October, it now rates second. Shanghai still has plans to build the new record holder by 2007, even though its thousands of existing skyscrapers are thought to be contributing to the city literally sinking under its own weight.

Despite their problems, skyscrapers will continue to be erected. And no matter what the future practicalities may be, someone will always want to build a tower taller than their neighbor’s.

To view this article with illustrations, please go to the publisher’s web site and download a PDF of Sparks of Innovation magazine, which was published in 2004.
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when good ideas go bad

Not all innovations are success stories. For every Model-T, there’s an Edsel, and for every VHS recorder, a Betamax. Some ideas are ahead of their time, some are marketed badly, and some just plain stink. (New Coke, anyone?) Even the greatest innovators have come up with some real clunkers.

Thomas Edison has over 1000 patents to his name, but not all of them are as good as the light bulb or the phonograph. In the early 1900s, Edison came up with the idea of building cheap concrete housing. Concrete was poured into a mold, forming the sides, floors, ceilings and roof of the house as a single piece. A typical concrete home, with plumbing, heating and lighting, was supposed to cost less than $1200. Unfortunately, a builder had to buy at least $175,000 in equipment before pouring a single one. And the few houses that were built developed cracks as the concrete settled. Edison persevered in using concrete creatively, building concrete phonograph cabinets and other furniture, but — big surprise — those weren’t popular with the public, either, and newspaper cartoons ridiculed the idea. Edison quietly abandoned these innovations, and decided to stick to more conventional uses of concrete. His concrete company was for a time successful, even supplying concrete to build Yankee Stadium, but after several bankruptcies, it was closed shortly after his death.

Visionary architect and designer Le Corbusier’s experimental use of reinforced concrete frames in his buildings, such as Notre Dame du Haut (1955), influenced architects the world over. But Le Corbusier was also an influential city planner, envisioning modern, technologically ambitious “vertical cities” purged of bustling neighborhoods and congested, dirty streets: Everything was to be rational, logical, clean, ordered, planned: the new architecture was to meet its inhabitants’ every need from work to leisure, making for happy, productive citizens. Le Corbusier called his vision of this urban utopia “The Radiant City.” Unfortunately, when his concept was put into action, the results were anything but radiant, becoming a failed attempt at social engineering through architecture. In the US, his ideas were behind vast urban renewal schemes and regimented high-rise public housing projects that devastated existing neighborhoods and concentrated crime and other social problems in one place. Modern they might have been, but they were also socially destructive.

Buckminster Fuller was also a visionary, interested in doing more with less. His invention of the geodesic dome created the lightest, strongest and most cost-effective structure yet built. In 1933, Fuller built the futuristic-looking Dymaxion Car in response to the inefficient and fuel-wasting automobiles he saw around him. The Dymaxion Car was aerodynamically styled to resemble an airplane. It rode on three wheels, could seat 11 people, was fast, and got excellent gas mileage. Unfortunately, it crashed during an impromptu drag race through the streets of Chicago, killing its driver and seriously injuring a passenger. Though it was later shown that the crash was caused by reckless driving rather than poor design, because of the bad publicity, Fuller abandoned the project. As with most of his ideas, he was interested primarily in testing and proving his design principles, not manufacturing and marketing them.

To have a lasting, positive impact on the world, just being innovative isn’t enough. Perhaps with a few changes, a simple understanding of what people are willing to live with, and even better marketing, some of these ideas might have been more successful. Today, after all, concrete houses are commonplace. But planning the birth of a new social system using architecture remains a tall order.

To view this article with illustrations, please go to the publisher’s web site and download a PDF of Sparks of Innovation magazine, which was published in 2004.
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tiny bubbles, better bubbly

Want the best champagne for your New Year’s Eve bash? Look for the bubbly with the smallest bubbles, report French scientists in the Dec. 17 issue of the Journal of Agricultural and Food Chemistry. Gerard Liger-Belair of the University of Reims Champagne-Ardenne in France (where else?) and his colleagues found that champagne’s uniquely tiny, rising bubbles are the key to its aroma and flavor, and the more you have, the better. Smaller bubbles mean you’ll have more bubbles to pick up and release the wine’s flavor and aroma molecules as they burst onto the surface of the liquid, creating the refreshing zing of a good champagne. The researchers studied bubble formation and found that carbon dioxide, surprisingly, was not the main factor in determining bubble size in champagne, as it is in other beverages. Rather, dissolved salts, carbohydrates, and minerals in the wine play a much larger role than previously thought. They hope to develop a computer model that will help them create the perfect bubble. Liger-Belair, who is also a consultant with Moet & Chandon, flatly stated, “Our ultimate goal is to create smaller bubbles in champagne wines.” We’ll toast to that.

This news brief appeared in the Random Data column of the Boston Globe’s Health/Science section on 12/30/2003.
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cholesterol-free mouse

With the glut of cholesterol-free everything on the market, now comes the cholesterol-free mouse, reports an international team of researchers in the Dec. 19 Science. Cholesterol, despite being notorious for clogging arteries and contributing to heart disease and strokes, has long been considered integral for survival. The fat-like substance plays many roles in the body, being vital for cellular signaling and the formation of hormones, and it is an essential structural building block of cells and their membranes. But now researchers from Quark Biotech Inc. in the United States, the Karolinska Institute in Sweden, and the Sackler School of Medicine in Israel have created mice with a genetic mutation that disrupts the manufacture of cholesterol in their bodies, replacing it with a substance called desmosterol. The cholesterol-free mice were 25 percent smaller than normal when born and both males and females were infertile, but were otherwise relatively healthy. In humans, a similar genetic deficiency causes severe abnormalities. “We were surprised by the fact that a mouse lacking cholesterol can survive and develop into adulthood with little effect,” stated study author Elena Feinstein of Quark Biotech.

This news brief appeared in the Random Data column of the Boston Globe’s Health/Science section on 12/30/2003.
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