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October 7, 2008

Astronomers Find a Planet Denser Than Lead

Astronomers find a planet denser than lead

Meet the planet COROT-exo-3b. It orbits a star slightly larger, hotter, and brighter than the Sun. The star is not an unusual one in any way, but the planet is definitely weird: it orbits the star in just over 4 days, which is pretty close in, though not a record breaker in and of itself. What’s bizarre is that it has about the same diameter of Jupiter, but has 21.6 times Jupiter’s mass. That makes it denser than lead.

This planet is challenging to models. How did it form? It most likely formed farther out from the star — gravitational influences make it hard for a large planet to form close to a star — and then gradually moved in.

It was discovered by COROT, an orbiting European Space Agency mission designed to look for stars that dip in brightness as an orbiting planet passes in front of them. That gives the size of the planet (the amount the light dims is proportional to the size of the planet).

As a planet (the alternative is classifying it as a brown dwarf - a failed star, not a planet), COROT-exo-3b would be the densest known planet.

Related: COROT discovery stirs exoplanet classification rethink - Planet, Less Dense Than Cork, Is Discovered - Hot Ice Planet - Physics May Need a Revision

August 22, 2008

Very Long-Term Backup

Very Long-Term Backup by Kevin Kelly

This graphic side of the disk is pure titanium. A black oxide coating has been added to the surface. The text is etched into that, revealing the whiter titanium. This bold sign board is needed because the pages of genesis which are etched on the mirror-like opposite side of the disk are nearly invisible.

This business side of the disk is pure nickel. Picking it up you would not be aware there were 13,500 pages of linguistic gold hiding on it. The nickel is deposited on an etched silicon disk. In effect the Rosetta disk is a nickel cast of a micro-etch silicon mold. When the disk is held at the right angle the grid array of the pages form a slight diffraction rainbow. You need a 750-power optical microscope to read the pages.

The Rosetta disk is not digital. The pages are analog “human-readable” scans of scripts, text, and diagrams. Among the 13,500 scanned pages are 1,500 different language versions of Genesis 1-3, a universal list of the words common for each language, pronunciation guides and so on. Some of the key indexing meta-data for each language section (such as the standard linguistic code number for that language) are displayed in a machine-readable font (OCRb) so that a smart microscope could guide you through this analog trove.

Our hope is that at least one of the eight headline languages can be recovered in 1,000 years. But even without reading, a person might guess there are small things to see in this disk.

This is another project of an organization I like very much: The Long Now Foundation.

Related: The Future of Science - Engineering at Home - 1,000 True Fans

August 11, 2008

Invisibility Cloak Closer

Invisibility shields one step closer with new metamaterials that bend light backwards

Applications for a metamaterial entail altering how light normally behaves. In the case of invisibility cloaks or shields, the material would need to curve light waves completely around the object like a river flowing around a rock. For optical microscopes to discern individual, living viruses or DNA molecules, the resolution of the microscope must be smaller than the wavelength of light.

The common thread in such metamaterials is negative refraction. In contrast, all materials found in nature have a positive refractive index, a measure of how much electromagnetic waves are bent when moving from one medium to another.

In a classic illustration of how refraction works, the submerged part of a pole inserted into water will appear as if it is bent up towards the water’s surface. If water exhibited negative refraction, the submerged portion of the pole would instead appear to jut out from the water’s surface.

For a metamaterial to achieve negative refraction, its structural array must be smaller than the electromagnetic wavelength being used. Not surprisingly, there has been more success in manipulating wavelengths in the longer microwave band, which can measure 1 millimeter up to 30 centimeters long.

Related: Engineering Harry Potter’s Invisibility Cloak - UC-Berkeley Course Videos now on YouTube - posts on university based research - Berkeley tagged posts

August 6, 2008

Werner Heisenberg

photo of Werner Heisenberg

Read a very nice biography from Center for History of Physics of the American Institute of Physics for Werner Heisenberg, the founder of quantum mechanics, and the Heisenberg uncertainty principle:

Heisenberg set himself the task of finding the new quantum mechanics upon returning to Göttingen from Copenhagen in April 1925. Inspired by Bohr and his assistant, H.A. Kramers, in Copenhagen, Pauli in Hamburg, and Born in Göttingen, Heisenberg’s intensive struggle over the following months to achieve his goal has been well documented by historians. Since the electron orbits in atoms could not be observed, Heisenberg tried to develop a quantum mechanics without them.

He relied instead on what can be observed, namely the light emitted and absorbed by the atoms. By July 1925 Heisenberg had an answer, but the mathematics was so unfamiliar that he was not sure if it made any sense. Heisenberg handed a paper on the derivation to his mentor, Max Born, before leaving on a month-long lecture trip to Holland and England and a camping trip to Scandinavia with his youth-movement group. After puzzling over the derivation, Born finally recognized that the unfamiliar mathematics was related to the mathematics of arrays of numbers known as “matrices.” Born sent Heisenberg’s paper off for publication. It was the breakthrough to quantum mechanics.

Related: 1932 Nobel Prize in Physics - photo, 1927 - Uncertainty: Einstein, Heisenberg, Bohr, and the Struggle for the Soul of Science by David Lindley - 2007 Nobel Prize in Physics - posts on physics

July 5, 2008

500 Million-year-old Stromatolite Fossil

VMNH scientists confirm discovery of 500 million-year-old fossil

Virginia Museum of Natural History scientists have confirmed that an approximately 500 million-year-old stromatolite was recently discovered at the Boxley Blue Ridge Quarry near Roanoke, Virginia. This is the first-ever intact stromatolite head found in Virginia, and is one of the largest complete “heads” in the world, at over 5 feet in diameter and weighing over 2 tons. Stromatolites are among the earliest known life forms, and are important in helping scientists understand more about environments that existed in the past.

A stromatolite is a mound produced in shallow water by mats of algae that trap mud and sand particles. Another mat grows on the trapped sediment layer and this traps another layer of sediment, growing gradually over time. Stromatolites can grow to heights of a meter or more. They are uncommon today but their fossils are among the earliest evidence for living things. The oldest stromatolites have been dated at 3.46 billion years old.

Related: Giant Duck-Billed Dinosaur Discovered in Mexico - Fossils of Sea Monster

June 6, 2008

Why did China’s Scientific Innovation Stop?

Why did China’s scientific innovation, once so advanced, suddenly collapse

By the time Joseph Needham died in 1995, he had published 17 volumes of his Science and Civilisation in China series, including several that he wrote entirely on his own.

The Chinese began printing 600 years before Johannes Gutenberg introduced the technique in Germany. They built the first chain drive 700 years before the Europeans. And they made use of a magnetic compass at least a century before the first reference to it appeared elsewhere. So why, in the middle of the 15th century, did this advanced civilisation suddenly cease its spectacular progress?

Needham never fully worked out why China’s inventiveness dried up. Other academics have made their own suggestions: the stultifying pursuit of bureaucratic rank in the Middle Kingdom and the absence of a mercantile class to foster competition and self-improvement; the sheer size of China compared with the smaller states of Europe whose fierce rivalries fostered technological competition; its totalitarianism.

Related: Science and Engineering in Politics - Economic Benefits from Engineering - Chinese Engineering Innovation Plan - Best Research University Rankings (2007)

The Science Barge

photo of the science barge in NYC
The Science Barge is a prototype, sustainable urban farm and environmental education center. It is the only fully functioning demonstration of renewable energy supporting sustainable food production in New York City. The Science Barge grows tomatoes, cucumbers, and lettuce with zero net carbon emissions, zero chemical pesticides, and zero runoff.

From May to October 2007, the Science Barge hosted over 3,000 schoolchildren from all five New York boroughs as well as surrounding counties as part of our environmental education program. In addition, over 6,000 adult visitors visited the facility along with press from around the world.

NY Sun Works: The Science Barge

Limited growing space means growing upwards, with stacked pots for strawberries, and vines that grow up to the ceiling and are then folded over to grow back down. Instead of using pesticides, pests are kept in check using ladybugs, parasitic wasps, and other predators as needed. Environmentally friendly substrates such as rice husks, coconut shells, and Earth Stone (recycled glass), are used to aerate the root systems for the plants.

Most fascinating of all was the Aquaponic system for providing nutrients to the plants using catfish. Nutrients from the plants and worms feed the catfish, who produce nitrogen-rich waste, which feeds the plants. Tilapia were originally used, but eventually replaced with catfish, which were better suited to the climate. The result of all this effort is a bounty of fresh fruits and vegetables given out to all the children who visit the barge.

Great stuff. Related: Skyscraper Farming - Science, Education and Community - other posts on environmental solutions

May 30, 2008

11 Science Journalist Fellows at MIT

The Knight Fellowship at MIT has a class of eleven science journalists from six countries this year. All are mid-career journalists who work for general interest news media to improve the public understanding of science. They will take a sabbatical year from their jobs to improve their knowledge by taking courses at MIT and Harvard, interviewing scientists and attending various seminars and lectures during the 2008–2009 academic year. They take up residence in Cambridge in August 2008.

The fellows include: Kimani Chege, editor of TechNews Africa, from Kenya; Sabin Russell, medical writer at The San Francisco Chronicle, from the USA; Teresa Firmino, science and technology reporter for Público, from Portugal; Jonathan Fildes, science and technology reporter for BBC News, from England; and Rachel Zimmerman, health and medicine reporter for The Wall Street Journal, from the USA.

This is a great program to help some excellent science journalist to get even better. We need more excellent science journalism.

We list the Knight Science Journalism Tracker on the list of our favorite science and engineering blogs.

Related: Science Journalism - Science and Engineering Fellowship Directory - Report on the Use of Online Science Resources

April 23, 2008

$60 Million for Science Teaching at Liberal Arts Colleges

HHMI Awards $60 Million to Invigorate Science Teaching at Liberal Arts Colleges

A year ago, the Howard Hughes Medical Institute issued a challenge to 224 undergraduate colleges nationwide: identify creative new ways to engage your students in the biological sciences.

Now 48 of the nation’s best undergraduate institutions will receive $60 million to help them usher in a new era of science education. This includes the largest number of new grantees in more than a decade; more than a quarter have never received an HHMI grant before.

Colleges in 21 states and Puerto Rico will receive $700,000 to $1.6 million over the next four years to revitalize their life sciences undergraduate instruction. HHMI has challenged colleges to create more engaging science classes, bring real-world research experiences to students, and increase the diversity of students who study science.

Creating interdisciplinary science classes and incorporating more mathematics into the biology curriculum were among the major themes proposed by the schools. Many schools will also allow more students to experience research through classroom-based courses and summer laboratory programs.

HHMI is the nation’s largest private supporter of science education. It has invested more than $1.2 billion in grants to reinvigorate life science education at both research universities and liberal arts colleges and to engage the nation’s leading scientists in teaching. In 2007, it launched the Science Education Alliance, which will serve as a national resource for the development and distribution of innovative science education materials and methods.

Related: $60 Million in Grants for Universities (2007) - Genomics Course For College Freshman Supported by HHMI at 12 Universities - $600 Million for Basic Biomedical Research - Funding Medical Research - posts on science and engineering funding

April 18, 2008

Medical Study Integrity (or Lack Thereof)

Merck wrote drug studies for doctors

The drug maker Merck drafted dozens of research studies for a best-selling drug, then lined up prestigious doctors to put their names on the reports before publication, according to an article to be published Wednesday in a leading medical journal.

The article, based on documents unearthed in lawsuits over the pain drug Vioxx, provides a rare, detailed look in the industry practice of ghostwriting medical research studies that are then published in academic journals.

“It almost calls into question all legitimate research that’s been conducted by the pharmaceutical industry with the academic physician,” said Ross, whose article, written with colleagues, was published Wednesday in JAMA, The Journal of the American Medical Association, and posted Tuesday on the journal’s Web site.

Merck acknowledged Tuesday that it sometimes hired outside medical writers to draft research reports before handing them over to the doctors whose names eventually appear on the publication. But the company disputed the article’s conclusion that the authors do little of the actual research or analysis.

It is sad that the integrity of journals and scientists is so weak that they leave them open to such charges. The significant presence of the corrupting influence of too much money leaves doubt in my mind that the best science is the goal. Which is very sad. In, Funding Medical Research, I discussed my concern that universities are acting more like profit motivated organizations than science motivated organizations. I am in favor of profit motivated organization (those getting the micro-financing in this link, for example) but those organization should not be trusted to provide honest and balanced opinions they should be expected to provide biased opinions.

If universities (and scientists branding themselves as … at X university) want to be seen as honest brokers of science they can’t behave as though raising money, getting patents… are their main objectives. Many want to be able to get the money and retain the sense of an organization focused on the pursuit of science above all else. Sorry, you can’t have it both ways. You can, and probably should, try stake out some ground in the middle. And for me right now, partially because they fail to acknowledge the extent to which money seems to drive decisions I don’t believe they are trying to be open and honest, instead I get the impression they are leaning more toward trying to market and sell.
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April 11, 2008

NASA Science Website

The NASA Science Mission Directorate sponsors scientific research, and develops and deploys satellites and probes in collaboration with NASA’s partners around the world to answer fundamental questions requiring the view from and into space. SMD seeks to understand the origins, evolution, and destiny of the universe and to understand the nature of the phenomena that shape it. SMD also seeks to understand:

* the nature of life in the universe and what kinds of life may exist beyond Earth;
* the solar system, both scientifically and in preparation for human exploration; and
* the Sun and Earth, changes in the Earth-Sun system, and the consequences of the Earth-Sun relationship for life on Earth.

Maybe, for this site NASA actually listened to the engineers: as this site works rather than making false claims about the visitor’s browser. The site includes content specifically targeted at teachers, students, researchers and the general public.

Related: Great Self Portrait - Boiling Water in Space - Mars Rovers Getting Ready for Another Adventure

April 4, 2008

Vega Science Lectures: Feynman and More

Vega Science Lectures

Vega is building a collection of classic lectures by eminent scientists, both from its own source material and donations from universities and other independent groups such as the Feynman family.

A set of four priceless archival recordings from the University of Auckland (New Zealand) of the outstanding Nobel prize-winning physicist Richard Feynman - arguably the greatest science lecturer ever. Although the recording is of modest technical quality the exceptional personal style and unique delivery shine through.

Great content. Enjoy.

Related: BBC In Our Time Science Podcasts - directory of science and engineering webcasts - YouTube+ for Science from PLoS - The Best Science Books

April 2, 2008

Orzel: What Everyone Should Know About Science

What Everyone Should Know About Science by Chad Orzel:

1) Science is a Process, Not a Collection of Facts The essence of science, broadly defined, is that it is a systematic approach to figuring out how the world works:

1. look at the world around you
2. come up with an idea for why it might work that way.
3. test your idea against reality.
4. tell everybody you know the results of the test.

Put those steps together, over and over, and you have the best method ever devised for increasing our store of reliable knowledge. The precise facts found by this method are not as important as the process for finding them– given the process, and enough time, you can reconstruct whatever facts you need. The facts without the process are worse than useless, they’re dangerous.

Related: What Everyone Should Learn - What Makes Scientists Different :-) - Scientists Search for Clues To Bee Mystery - Peru Meteorite Provides Puzzles

March 22, 2008

Scientific American Frontiers Webcasts

All shows of the PBS TV show, Scientific American Frontiers are available online. The shows feature Alan Alda exploring a wide range of scientific ideas. Specific information for teachers if provided for each show. Shows include:

  • Going Deep - “In 1977, scientists aboard Alvin were exploring the Galapagos Rift in the Pacific Ocean when they made one of the most important discoveries in modern biology. Hydrothermal vents are underwater volcanoes erupting magma-heated, mineral-rich water out of cracks on the seafloor thousands of feet beneath the surface. Despite the enormous pressure and total darkness, the vents were found to support an astonishing array of animal life.”
  • The Dark Side of the Universe - Dark matter, dark energy and the universe.
  • Natural Born Robots - “The next generation of robots swim like fish, play soccer and even experience emotions.”
  • Science and Sports - “Science enables people to run quicker, climb higher, hit farther, and sail faster in this sports special.”

Related: BBC In Our Time Science Podcast Archive - Curious Cat Science Webcast Directory - Online Science Resources for Teachers - UC-Berkeley Course Videos Online - ScienceLive video archive from Cambridge University

March 9, 2008

Scientists and Engineers in Congress

A list of Congressmen with science PhDs: Vernon Ehlers, Michigan, physics PhD; Rush Holt, New Jersey, physics PhD; John Olver, Massachusetts, chemistry PhD; Brian Baird, Washington, psychology PhD; and now Bill Foster, Illinois, physics PhD. Other scientists, engineers and mathematicians include: Ron Paul, Texas, biology BS, MD; Jerry McNerney, California, math PhD; Dan Lipinski, Illinois, mechanical engineering BS, engineering-economic systems MS; Nancy Boyda, Kansas, chemistry BS; Cliff Stearns, Florida, electrical engineering BS; Joe Barton, Texas, industrial engineering BS. Please comment with additions.

Another Scientist in Congress!

He is not just any old particle physicist, but quite an accomplished one, having been a co-inventor of Fermilab’s antiproton Recycler Ring. Once you’ve mastered antiprotons, the Washington political process should be child’s play. Congratulations!

Related: China’s Technology Savvy Leadership - Scientists and Politics - Why Congress Needs More Scientists - At Last, a Politician Who Knows Quantum Mechanics

Vernon Ehlers - “After three years of studying at Calvin College in Grand Rapids, Ehlers transferred and received his undergraduate degree in physics and his Ph.D. in nuclear physics from the University of California at Berkeley in 1960. After six years teaching and research at Berkeley, he moved back to Grand Rapids to Calvin College in 1966 where he taught physics for 16 years and later served as chairman of the Physics Department. During his tenure at Calvin, Ehlers also served as a volunteer science advisor to then-Congressman Gerald R. Ford.”

Russ Holt - Rep. Holt earned his B.A. in Physics from Carleton College in Minnesota and completed his Master’s and Ph.D. at NYU. He has held positions as a teacher, Congressional Science Fellow, and arms control expert at the U.S. State Department where he monitored the nuclear programs of countries such as Iraq, Iran, North Korea, and the former Soviet Union. From 1989 until he launched his 1998 congressional campaign, Holt was Assistant Director of the Princeton Plasma Physics Laboratory, the largest research facility of Princeton University and the largest center for research in alternative energy in New Jersey. He has conducted extensive research on alternative energy and has his own patent for a solar energy device. Holt was also a five-time winner of the game show “Jeopardy.”
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March 8, 2008

Laws of Physics May Need a Revision

Something seems wrong with the laws of physics

Einstein’s general theory of relativity swept Newton away by showing that gravity operates by distorting space itself.

Even Einstein, however, may not have got it right. Modern instruments have shown a departure from his predictions, too. In 1990 mission controllers at the Jet Propulsion Laboratory (JPL) in Pasadena, California, which operates America’s unmanned interplanetary space probes, noticed something odd happen to a Jupiter-bound craft, called Galileo. As it was flung around the Earth in what is known as a slingshot manoeuvre (designed to speed it on its way to the outer solar system), Galileo picked up more velocity than expected. Not much. Four millimetres a second, to be precise. But well within the range that can reliably be detected.

Altogether, John Anderson and his colleagues analysed six slingshots involving five different spacecraft. Their paper on the matter is about to be published in Physical Review Letters. Crucially for the idea that there really is a systematic flaw in the laws of physics as they are understood today, their data can be described by a simple formula. It is therefore possible to predict what should happen on future occasions.

That is what Dr Anderson and his team have now done. They have worked out the exact amount of extra speed that should be observed when they analyse the data from a slingshot last November, which involved a craft called Rosetta. If their prediction is correct, it will confirm that the phenomenon is real and that their formula is capturing its essence. Although the cause would remain unknown, a likely explanation is that something in the laws of gravity needs radical revision.

An interesting puzzle that illustrates how scientists attempt to confirm our understanding and real world results. And those efforts include uncertainty and confusion. Too often, I think, people think science is only about absolute truth and facts without any room for questions. We understand gravity well, but that does not mean we have no mysteries yet to solve about gravity.

Research paper: The Anomalous Trajectories of the Pioneer Spacecraft

Related: NASA Baffled by Unexplained Force Acting on Space Probes - Mysterious Effect May Influence Spacecraft Trajectories - Earth’s rotation may account for wayward spacecraft - Pioneer anomaly put to the test - Understanding Evolution - Scientists Search for Clues To Bee Mystery

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