Science – Page 41 – artdiamondblog.com

Toricelli Experiment Dispoved Aristotlelian Theory that a Vacuum Was Impossible

(p. 8) Florence, in the year 1641, had been essentially the private fief of the Medici family for two centuries. The city, ground zero for both the Renaissance and the Scientific Revolution, was also where Galileo Galilei had chosen to live out the sentence imposed by the Inquisition for his heretical writings that argued that the earth revolved around the sun. Galileo was seventy years old and living in a villa in Arcetri, in the hills above the city, (p. 9) when he read a book on the physics of movement titled De motu (sometimes Trattato del Moto) and summoned its author, Evangelista Torricelli, a mathematician then living in Rome. Torricelli, whose admiration for Galileo was practically without limit, decamped in time not only to spend the last three months of the great man’s life at his side, but to succeed him as professor of mathematics at the Florentine Academy.
. . .
(p. 9) . . . , Torricelli used a tool even more powerful than his well–cultivated talent for mathematical logic: He did experiments. At the behest of one of his patrons, the Grand Duke of Tuscany, whose engineers were unable to build a sufficiently powerful pump, Torricelli designed a series of apparatuses to test the limits of the action of contemporary water pumps. In spring of 1644, Torricelli filled a narrow, four-foot-long glass tube with mercury–a far heavier fluid than water–inverted it in a basin of mercury, sealing the tube’s top. and documented that while the mercury did not pour out, it did leave a space at the closed top of the tube. He reasoned that since nothing could have slipped past the mercury in the tube, what occupied the top of the tube must, therefore, be nothing: a vacuum.
. . .
(p. 10) Torricelli was not, even by the standards of his day, a terribly ambitious inventor. When faced with hostility from religious authorities and other traditionalists who believed, correctly, that his discovery was a direct shot at the Aristotelian world, he happily returned to his beloved cycloids, the latest traveler to find himself on the wrong side of the boundary line between science and technology
But by then it no longer mattered if Torricelli was willing to leave the messiness of physics for the perfection of mathematics: vacuum would keep mercury in the bottle, hut the genie was already out. Nature might have found vacuum repugnant for two thousand years, but Europe was about to embrace it.

Source:
Rosen, William. The Most Powerful Idea in the World: A Story of Steam, Industry, and Invention. New York: Random House, 2010.
(Note: italics in original; ellipses added.)

How Scientific Progress Was Slowed By Too Much Respect for Aristotelian Theory

William Rosen has a wonderful early example of how too much respect for theory can keep us from making the observations that would eventually prove the theory to be wrong:

(p. 7) Aristotle argued against the existence of a vacuum with unerring, though curiously inelegant, logic. His primary argument ran something like this:

1. If empty space can be measured, then it must have dimension.
2. If it has dimension, then it must be a body (this is something of a tautology: by Aristotelian definition, bodies are things that have dimension).
3. Therefore, anything moving into such a previously empty space would he occupying the same space simultaneously, and two bodies cannot do so.
More persuasive was the argument that a void is unnecessary, that since the fundamental character of an object consists of those measurable dimensions, then a void with the same dimensions as the cup, or horse, or ship occupying it is no different from the object. One, therefore, is redundant, and since the object cannot be superfluous, the void must be.
It takes millennia to recover from that sort of unassailable logic, temptingly similar to that used in Monty Python and the Holy GraiI to demonstrate that if a woman weighs as much as a duck, she is a witch. Aristotle’s blind spot regarding the existence of a void would be inherited by a hundred generations of his adherents. Those who read the work of Heron did so through an Aristotelian scrim on which was printed, in metaphorical letters twenty feet high: NATURE ABHORS A VACUUM.

Source:
Rosen, William. The Most Powerful Idea in the World: A Story of Steam, Industry, and Invention. New York: Random House, 2010.
(Note: italics in original.)

William Rosen’s “The Most Powerful Idea in the World”

Source of book image: http://ffbsccn.files.wordpress.com/2010/07/the-most-powerful-idea-in-the-world.jpg

The range of William Rosen’s fascinating and useful book is very broad indeed. He is interested in THE question: why did the singular improvement in living standards known as the industrial revolution happen where and when it did?
The question is not just of historical interest—if we can figure out what caused the improvement then and there, we have a better shot at continuing to improve in the here and now.
I especially enjoyed and learned from William Rosen’s discussion, examples and quotations on the difficult issue of whether patents are on balance a good or bad institution.
Deirdre McCloskey taught me that the most important part of a sentence is the last word, and the most important part of a paragraph is the last sentence, and the most important part of a chapter is the last paragraph.
Here are the last couple of sentences of Rosen’s book:

(p. 324) Incised in the stone over the Herbert C. Hoover Building’s north entrance is the legend that, with Lincoln’s characteristic brevity, sums up the single most important idea in the world:

THE PATENT SYSTEM ADDED

THE FUEL OF INTEREST

TO THE FIRE OF GENIUS

In the next few weeks I will occasionally quote a few of the more illuminating passages from Rosen’s well-written account.

Book discussed:
Rosen, William. The Most Powerful Idea in the World: A Story of Steam, Industry, and Invention. New York: Random House, 2010.

“A Very Clear-Thinking Heretic” Doubted Big Bang Theory

“Geoffrey Burbidge’s work in astronomy changed the field.” Source of caption and photo: online version of the NYT obituary quoted and cited below.

(p. 26) Geoffrey Burbidge, an English physicist who became a towering figure in astronomy by helping to explain how people and everything else are made of stardust, died on Jan. 26 in San Diego. He was 84.
. . .
Dr. Burbidge’s skepticism extended to cosmology. In 1990, he and four other astronomers, including Drs. Arp and Hoyle, published a broadside in the journal Nature listing arguments against the Big Bang.
Dr. Burbidge preferred instead a version of Dr. Hoyle’s Steady State theory of an eternal universe. In the new version, small, local big bangs originating in the nuclei of galaxies every 20 billion years or so kept the universe boiling. To his annoyance, most other astronomers ignored this view.
In a memoir in 2007, Dr. Burbidge wrote that this quasi-steady state theory was probably closer to the truth than the Big Bang. But he added that “there is such a heavy bias against any minority point of view in cosmology that it may take a very long time for this to occur.”
Despite his contrarian ways, Dr. Burbidge maintained his credibility in the astronomical establishment, serving as director of Kitt Peak from 1978 to 1984 and editing the prestigious Annual Review of Astronomy and Astrophysics for more than 30 years. He was “a very clear-thinking heretic,” Dr. Strittmatter said.

For the full obituary, see:

DENNIS OVERBYE. “Geoffrey Burbidge, Who Traced Life to Stardust, Is Dead at 84 ” The New York Times, First Section (Sun., February 7, 2010 ): A7.
(Note: ellipsis added.)
(Note: the online version of the obituary is dated February 6, 2010.)

More than a Quarter of Weathercasters Believe “Global Warming is a Scam”

(p. A1) Joe Bastardi, . . . , a senior forecaster and meteorologist with AccuWeather, maintains that it is more likely that the planet is cooling, and he distrusts the data put forward by climate scientists as evidence for rising global temperatures.

“There is a great deal of consternation among a lot of us over the readjustment of data that is going on and some of the portrayals that we are seeing,” Mr. Bastardi said in a video segment posted recently on AccuWeather’s Web site.
Such skepticism appears to be widespread among TV forecasters, about half of whom have a degree in meteorology. A study released on Monday by researchers at George Mason University and the University of Texas at Austin found that only about half of the 571 television weathercasters surveyed believed that global warming was occurring and fewer than a third believed that climate change was “caused mostly by human activities.”
More than a quarter of the weathercasters in the survey agreed with the statement “Global warming is a scam,” the researchers found.

For the full story, see:
LESLIE KAUFMAN. “Scientists and Weathercasters at Odds over Climate Change.” The New York Times (Tues., March 30, 2010): A1 & A16.
(Note: ellipsis added.)
(Note: the online version of the article was dated March 29, 2010 and had the title “Among Weathercasters, Doubt on Warming.”)

Vatican Made Bellarmine a Saint in 1930, but Still Says Galileo Erred

“A bust of Galileo at the Galileo Museum in Florence, Italy. The museum is displaying recovered parts of his body.” Source of caption and photo: online version of the NYT article quoted and cited below.

(p. A9) As a heretic he could not be given a proper church burial. But for years after his death, his followers in the circle of the grand dukes of Tuscany pushed to give him an honorable resting place.

Nearly a century later, in 1737, members of Florence’s cultural and scientific elite unearthed the scientist’s remains in a peculiar Masonic rite. Freemasonry was growing as a counterweight to church power in those years and even today looms large in the Italian popular imagination as an anticlerical force.
According to a notary who recorded the strange proceedings, the historian and naturalist Giovanni Targioni Tozzetti used a knife to slice off several fingers, a tooth and a vertebra from Galileo’s body as souvenirs but refrained, it appears, from taking his brain. The scientist was then reburied in a ceremony, “symmetrical to a beatification,” said Mr. Galluzzi.
After taking their macabre souvenirs, the group placed Galileo’s remains in an elegant marble tomb in Florence’s Santa Croce church, a pointed statement from Tuscany’s powers that they were outside the Vatican’s control. The church has long been a shrine to humanism as much as to religion, and Galileo’s permanent neighbors include Michelangelo, Machiavelli and Rossini.
. . .
Even today, centuries after Cardinal Robert Bellarmine, the pope’s theological watchdog, had Galileo arrested for preaching Copernicanism, the church has never quite managed to acknowledge that his heliocentric theory is correct. (For his part, Cardinal Bellarmine was made a saint in 1930.)
Pope John Paul II reopened the Galileo case in 1981, and in 1992 issued his committee’s findings: that the judges who condemned Galileo had erred but that the scientist had also erred in his arrogance in thinking that his theory would be accepted with no physical evidence.
. . .
. . . as recently as last fall, at a news conference introducing an exhibition of historic telescopic instruments at the Vatican Museums, the director of the Vatican’s Pontifical Council for Culture, Monsignor Gianfranco Ravasi, referred without blinking to “the errors committed by both sides” — indicating both the church and Galileo.

For the full story, see:
RACHEL DONADIO. “Florence Journal; A Museum Display of Galileo Has a Saintly Feel.” The New York Times (Fri., July 23, 2010): A1 & A9.
(Note: ellipses added.)
(Note: the online version of the article was dated July 22, 2010.)

Carbon Dioxide Increased After the Globe Warmed, Not Before

The passages quoted below are from an opinion piece by retired physicist Jack Kasher who was a colleague of mine at the University of Nebraska at Omaha.

I was pleased to see that the Millard school district pulled Laurie David’s book, “The Down-to-Earth Guide to Global Warming,” due to “a major factual error” in a chart that shows rising temperatures and carbon dioxide levels dating back 650,000 years. The chart claims to show that global warming is caused by increases in carbon dioxide levels, but the facts show that this is not the case.

In May, I attended an international conference on global warming in Chicago, with 73 speakers from 23 countries. The book and its erroneous chart were discussed there. (Go online to http://www.heartland.org/events/2010Chicago/index.html and click on “proceedings” to see most of the talks and PowerPoint presentations.)
When the error is corrected, the chart will show that in every single case over this time span the Earth warmed up first, followed by a later increase in carbon dioxide. This is clear proof that in the past global warming was not caused by an increase in CO2. If anything, it is the other way around. In each instance, something other than CO2 caused the temperature increase, which then might have made the CO2 rise. This chart shows that past history actually contradicts David’s main assumption in her book — namely that man-made carbon dioxide is causing global warming.

For the full commentary, see:

Dr. Jack Kasher. “Midlands Voices: Let’s include uncertainties in global-warming lessons.” Omaha World-Herald (Wednesday June 30, 2010): ??.

Scientific Opinion Shifts to Galambos Who Was Fired for His Theory

“Robert Galambos, . . . , studied the inaudible sounds that allow bats to fly in the dark.” Source of caption and photo: online version of the NYT article quoted and cited below.

(p. 20) Dr. Robert Galambos, a neuroscientist whose work included helping to prove how bats navigate in total darkness and deciphering the codes by which nerves transmit sounds to the brain, died June 18 at his home in the La Jolla section of San Diego. He was 96.
. . .
In 1960, while on an airplane, Dr. Galambos wrote that he had an inspiring thought: that the tiny cells that make up 40 percent of the brain, called glia, are as crucial to mental functioning as neurons.
“I know how the brain works!” he exclaimed to his companion.
But his superiors at Walter Reed found the theory so radical that he was soon job-hunting. The view at the time was that glia existed mainly to support neurons, considered the structural and functional unit of the nervous system. But Dr. Galambos clung to his belief, despite the failure of three experiments he performed in the 1960s.
Since then, scientific opinion has been shifting in his direction. In 2008, Ben A. Barres of the Stanford University School of Medicine wrote glowingly in the journal Neuron about the powerful role glia are now seen to play. He concluded, “Quite possibly the most important roles of glia have yet to be imagined.”

For the full obituary, see:
DOUGLAS MARTIN. “Robert Galambos, 96, Dies; Studied Nerves and Sound.” The New York Times, First Section (Sun., July 18, 2010): 20.
(Note: the online version of the article is dated July 15, 2010 and has the title “Robert Galambos, Neuroscientist Who Showed How Bats Navigate, Dies at 96.”)
(Note: ellipses added.)

Jefferson “Was Experimental and Had a Lot of Failures”

“In the vegetable garden at Monticello, his home in Virginia, Thomas Jefferson sowed seeds from around the world and shared them with farmers. He was not afraid of failure, which happened often.” Source of caption and photo: online version of the NYT article quoted and cited below.

Steven Johnson has written an intriguing argument that the intellectual foundation of the founding fathers was based as much on experimental science as on religion. The article quoted below provides a small bit of additional evidence in support of Johnson’s argument.

(p. D1) NEW gardeners smitten with the experience of growing their own food — amazed at the miracle of harvesting figs on a Brooklyn rooftop, horrified by the flea beetles devouring the eggplants — might be both inspired and comforted by the highs and lows recorded by Thomas Jefferson from the sun-baked terraces of his two-acre kitchen garden 200 years ago.

And they could learn a thing or two from the 19th-century techniques still being used at Monticello today.
“He was experimental and had a lot of failures,” Peter Hatch, the director of gardens and grounds, said on a recent afternoon, as we stood under a scorching sun in the terraced garden that took seven slaves three years to cut into the hill. “But Jefferson always believed that ‘the failure of one thing is repaired by the success of another.’ ”
After he left the White House in 1809 and moved to Monticello, his Palladian estate here, Jefferson grew 170 varieties of fruits and 330 varieties of vegetables and herbs, until his death in 1826.
As we walked along the geometric beds — many of them planted in an ancient Roman quincunx pattern — I made notes on the beautiful crops I had never grown. Sea kale, with its great, ruffled blue-green leaves, now full of little round seed pods. Egyptian onions, whose tall green stalks bore quirky hats of tiny seeds and wavy green sprouts. A pre-Columbian tomato called Purple Calabash, whose energetic vines would soon be trained up a cedar trellis made of posts cut from the woods.
“Purple Calabash is one of my favorites,” Mr. Hatch said. “It’s an acidic, al-(p. D7)most black tomato, with a convoluted, heavily lobed shape.”
Mr. Hatch, who has directed the restoration of the gardens here since 1979, has pored over Jefferson’s garden notes and correspondence. He has distilled that knowledge in “Thomas Jefferson’s Revolutionary Garden,” to be published by Yale University Press.

For the full story, see:
ANNE RAVER. “A Revolutionary With Seeds, Too.” The New York Times (Thurs., July 1, 2010): D1 & D7.
(Note: the online version of the article is dated June 30, 2010 and has the title “In the Garden; At Monticello, Jefferson’s Methods Endure.”)

Economics Is More Like Biology than Physics

(p. A13) If economics is a science, it is more like biology than physics. Biologists try to understand the relationships in a complex system. That’s hard enough. But they can’t tell you what will happen with any precision to the population of a particular species of frog if rainfall goes up this year in a particular rain forest. They might not even be able to count the number of frogs right now with any exactness.

We have the same problems in economics. The economy is a complex system, our data are imperfect and our models inevitably fail to account for all the interactions.
The bottom line is that we should expect less of economists. Economics is a powerful tool, a lens for organizing one’s thinking about the complexity of the world around us. That should be enough. We should be honest about what we know, what we don’t know and what we may never know. Admitting that publicly is the first step toward respectability.

For the full commentary, see:

RUSS ROBERTS. “Is the Dismal Science Really a Science? Some macroeconomists say if we just study the numbers long enough we’ll be able to design better policy. That’s like the sign in the bar: Free Beer Tomorrow.” The Wall Street Journal (Thurs., FEBRUARY 26, 2010): A13.

Finding the Neanderthal in Us

“The Vindija cave in Croatia where three small Neanderthal bones were found.” Source of caption and photo: online version of the NYT article cited below.

(p. A3) The burly Ice Age hunters known as Neanderthals, a long-extinct species, survive today in the genes of almost everyone outside Africa, according to an international research team who offer the first molecular evidence that early humans mated and produced children in liaisons with Neanderthals.

In a significant advance, the researchers mapped most of the Neanderthal genome–the first time that the heredity of such an ancient human species has been reliably reconstructed. The researchers, able for the first time to compare the relatively complete genetic coding of modern and prehistoric human species, found the Neanderthal legacy accounts for up to 4% of the human genome among people in much of the world today.
By comparing the Neanderthal genetic information to the modern human genome, the scientists were able to home in on hints of subtle differences between the ancient and modern DNA affecting skin, stature, fertility and brain power that may have given Homo sapiens an edge over their predecessors.
“It is tantalizing to think that the Neanderthal is not totally extinct,” said geneticist Svante Pääbo at the Max Planck Institute for Evolutionary Anthropology in Leipzig, Germany, who pioneered the $3.8 million research project. “A bit of them lives on in us today.”
. . .
For their analysis, Dr. Pääbo and his colleagues extracted DNA mostly from the fossil remains of three Neanderthal women who lived and died in Croatia between 38,000 and 45,000 years ago. From thimblefuls of powdered bone, the researchers pieced together about three billion base pairs of DNA, covering about two-thirds of the Neanderthal genome. The researchers checked those samples against fragments of genetic code extracted from three other Neanderthal specimens.
“It is a tour de force to get a genome’s worth,” said genetic database expert Ewan Birney at the European Bioinformatics Institute in Cambridge, England.
In research published Thursday in Science, the researchers compared the Neanderthal DNA to the genomes drawn from five people from around the world: a San tribesman from South Africa; a Yoruba from West Africa; a Han Chinese; a West European; and a Pacific islander from Papua, New Guinea. They also checked it against the recently published genome of bio-entrepreneur Craig Venter. Traces of Neanderthal heredity turned up in all but the two African representatives.

For the full story, see:
ROBERT LEE HOTZ. “Most People Carry Neanderthal Genes; Team Finds up to 4% of Human Genome Comes From Extinct Species, the First Evidence It Mated With Homo Sapiens.” The Wall Street Journal (Fri., MAY 7, 2010): A3.
(Note: ellipsis added.)
(Note: the online version of the review is dated MAY 6, 2010.)

A related article, the online version of which is the source for the caption and photo above, is:
NICHOLAS WADE. “Analysis of Neanderthal Genome Points to Interbreeding with Modern Humans.” The New York Times (Fri., May 7, 2010): A9.
(Note: the online version of the review is dated May 6, 2010 and has the title “Signs of Neanderthals Mating With Humans.”)

“A close-up of the bone Vindija 33.16 from Vindija cave, Croatia.” Source of caption and photo: online version of the WSJ article quoted and cited above.