Friday, April 23, 2010

Divert from your real issues: Vatican shifts to stem cells

This headline intrigued me: "Vatican to finance adult stem cell research."

According to AP, "The Vatican has drawn criticism for its opposition to embryonic stem cell research. But the Vatican insists there are scientifically viable alternatives and the efforts of the scientific community should go in that direction. Financing this project is part of those efforts. But while embryonic stem cells are especially prized for their pluripotency — meaning they can morph into any type of cell in the body — adult stem cells are not as pluripotent. For that reason, embryonic stem cells are considered to have more potential for the treatment of diseases such as Alzheimer's, diabetes and Parkinson's.

ABC News covers the story, too.

Wednesday, April 21, 2010

Sugar and heart disease now linked

Emory University School of Medicine researcher Miriam Vos, MD, made a significant discovery about sugar - it increases the risk of heart disease.

A new study conducted by Emory, published in the Journal of American Medical Association, found that added sugars may increase cardiovascular disease risk factors.



The study analyzed U.S. government nutritional data and blood lipid levels in more than 6,000 adult men and women between 1999 and 2006. Participants were divided into five groups according to the amount of added sugar and caloric sweeteners they consumed daily.

Researchers found that people who consumed more added sugar were more likely to have higher cardiovascular disease risk factors, including higher triglyceride lev­els and higher ratios of triglycerides to HDL-C, or good cholesterol.

Sunday, April 18, 2010

Volcano Facination 2010

There is no doubt that the volcano in Iceland has captured the interest of people around the world. Its impact scientifically, socially and economically is facinating, and it is getting more complicated as the days continue with the eruption still under way today.

First, from scientific perspective, it is facinating and stokes our imaginations. This is a science lesson for everyone - how does a volcano decide to erupt after years of quietude. Go to Joe Palca's interview on NPR to learn from the Iceland scientists monitoring this volcano [there are more nearby].

And, it is beautiful and awesome to watch - images and video.
Air travel is halted and it is evident that we are more interdependent on movement than we pay attention to on a daily bais. The Times Online says airlines are looking for safe passages to use. The Dutch are testing normal flights, sans passengers except for crew.

Sunday, October 04, 2009

Quiet watchfulness

Buttermilk sky,
Layers over the morning sun,
The blue sky, almost October,
Shines a smiling light
So bright.


Life is shifting,
Calm and slow motion,
Of stillness and innerness,
Quiet watchfulness of Sophie and Dori,
Watching over the bed's foot,
Mac at the door.


Thanks to web shots for the image.

Morning sky after the storm

Torrents of rain,
Saturated and flooding,
Many days of misery for many,
Sailing from homes.



Today awakes,
The world, my world,
Powder blue, amost October sky,
Dabs of white painted here.

On the hill, over the city,
Light of morning,
Cast shapes of gold and lemon,
Over sturdy skyscrapers.

Mist low in altitude,
Creates a pattern, a mosaic,
Exhaled air,
Against the vertical.


Thank you to Tim's pictures for the image.

Thursday, June 25, 2009

Cancer discoveries everyday

An exciting basic discovery in cancer research was communicated yesterday - including in an online story at the BBC: Olaparib is the first successful example of a new type of personalised medicine using a technique called "synthetic lethality" - a subtle way of exploiting the body's own molecular weaknesses for positive effect. In this case the drug takes advantage of the fact that while normal cells have several different ways of repairing damage to their DNA, one of these pathways is disabled by the BRCA mutations in tumour cells. Olaparib blocks one of the repair pathways by shutting down a key enzyme called PARP.

Robert Bazell at NBC says: "All this enthusiasm is based on a small report published today in the New England Journal of Medicine. It focuses on one clinical trial in its earliest stage in 60 patients with breast, ovarian and prostate cancer. Some — but not all — of the patients whose cancers seemed hopeless saw them shrink drastically or disappear. Many avoided the typical side effects — nausea, hair loss — associated with cancer treatment."

Advances on many cancer fronts are coming fast and furiously, so much so it is hard to keep up with them. This is great for patients who are trying to directly treat their cancers without harming themselves while trying.

Thanks to createmotions for the image.

Tuesday, May 12, 2009

Conversation on Competition in Science

There is some conversation going on in the science world about competition, so you may want to follow this discussion in the NYT this week and last.


What if scientists, instead of rushing to publish or perish, chose to cooperate? Sean Cutler decided to do “a little experiment,” as he calls it, and you can see the results in the forthcoming issue of Science. "I can already anticipate that a lot of people will say, “This is a bad message. You are painting an unflattering portrait of scientists.” To this I respond: Most of the scientists I know are very good, passionate and ethical people who behave. But some don’t, and these unethical types gain an unfair advantage that needs to be addressed so that competitive forces can work their magic most effectively. Good ethics = good competition. They are not in opposition."


John Tierney asks in his NYT blog called TierneyLab: "How widespread do you believe this problem is? Have you seen this sort of unethical competition in your field? Ever engaged in it yourself?"

Saturday, May 02, 2009

Journey to the Center of ....

I just watched Journey to the Center of the Earth where the scientists fall through volcanic tubes... and then saw this story about being sucked into a black hole! This is a great story, so read A. Pawlowski's story on CNN. Thank you to UCLA for the image.

"To be sucked in by a black hole, you need to reach its event horizon, the one-way boundary beyond which nothing can escape. The more massive a black hole, the bigger this point of no return around it, said Jeff McClintock, a senior astrophysicist at the Harvard-Smithsonian Center for Astrophysics.
Scientists can try to simulate a trip inside with the help of equations in Albert Einstein's general theory of relativity, which make predictions about black hole behavior, said Andrew Hamilton, a professor of astrophysics at the University of Colorado at Boulder.

"Black holes are some of the simplest things in the universe. We think of them as being complicated things because they're described by complicated mathematics," Hamilton said.

"But as a practical matter, they are, in fact, much simpler than the sun, far simpler than stars and infinitely simpler than human beings."
"The same force ripping you apart would also concentrate the view of the universe into a thin band around your waist. It would cause the scene above and below you to appear redshifted, or dimmer, and the light around your waist to become blueshifted, or very bright, Hamilton said.
You may also regret that you only have two eyes. In a strange twist, Hamilton and Polhemus argue that three eyes would be needed to properly judge distances inside a black hole, where space-time is highly curved and our binocular vision would become confused."

Wednesday, April 22, 2009

Short or Poor Sleep Can Lead to More Eating and Risk of Diabetes

Studies continue to show that sleep curtailment or decreased sleep quality can disturb neuroendocrine control of appetite, leading to overeating, and can decrease insulin or increase insulin resistance, both steps on the road to Type 2 diabetes.

On April 22, at the Experimental Biology 2009 meeting in New Orleans, a panel of leading sleep researchers describes recent and new studies in this fast growing field. The session is part of the scientific program of the American Association of Anatomists (AAA).

Short sleep, poor sleep: novel risk factors for obesity and for type 2 diabetes.

Dr. Eve Van Cauter, University of Chicago, is a specialist in the effect of circadian rhythms on the endocrine system and has conducted several studies in which short-term sleep restriction damaged the body’s ability to regulate eating by lowering levels of leptin, the hormone that tells the body when it has had enough. In the AAA symposium, Dr. Van Cauter describes other recently published studies from her group, one showing that only three days sleep disruption is sufficient to increase insulin resistance in humans (thus causing the body to need higher levels of insulin) and a large epidemiological study showing that short sleep over a five year period causes an increase in systolic blood pressure.

Energy metabolism during chronic sleep deprivation: sleep less, eat more, don’t gain weight, yet show signs of progression toward diabetes.

Panel member Dr. Michael Koban, Morgan State University, reports a new study in which sleep restriction in rats led to glucose intolerance, a prediabetic state in which the blood glucose remains higher than normal after glucose challenge. Significantly, this is the first rodent study of sleep deprivation in which there was no association between glucose dysregulation and weight gain.

The researchers believe that extending sleep restriction will produce more pronounced glucose intolerance in which glucose levels do not return to normal levels for a longer period, thus providing more evidence that not sleeping enough could lead to diabetes in humans. The researchers also are looking for mechanisms to explain the change in metabolism related to sleep deprivation and the dissociation between weight gain and glucose dysregulation and insulin resistance.

Stress-related behaviors and hormone changes after prolonged sleep deprivation – and environmental factors that appear to modify them

Dr. Deborah Suchecki, Universidade Federal de Sao Paulo, describes how prolonged sleep deprivation activates the neuroendocrine stress response, as measured by increased blood levels of the stress-related hormones adrenaline, adrenocorticotropic hormone (ACTH), and corticosterone. Earlier studies have shown that sleep restriction in animals can gradually change brain and neuroendocrine systems in ways similar to those seen in stress-related disorders such as depression, while epidemiological studies suggest that sleep restriction may be an important risk factor for cardiovascular and other diseases linked to stress.

CNS changes after chronic sleep deprivation have role in both food intake and metabolism.

Dr. Gloria Hoffman, also of Morgan State University, presents studies that explain the role of the central nervous system pathways in stimulating feeding and causing metabolic changes associated with progression to diabetes. Specifically, increased production of the neurotransmitter neuropeptide Y and decreased production of proopiomelanocortiini products in the hypothalamus explain the hyperphagic response.

Although the CNS’s role in regulating metabolic rate is not well understood, she believes that histamine might be involved. Histamine neurons not only affect the maintenance of wakefulness but also are regulators of peripheral metabolism. In sleep deprived rats, elevations in the glucose to insulin ratio were positively correlated with an increase in histamine expression that raises the possibility that a dysregulation of histamine function during impaired sleep might serve to trigger metabolic and other changes leading to diabetes.

The scientists agree that as sleep curtailment becomes more common in industrialized countries it becomes increasingly important to understand how limited or poor quality sleep produces changes that can lead to obesity and diabetes, both epidemic in the developed world. More and more scientists are jumping on board with these lines of investigation, says Dr. Hoffman, and there is an increased demand for information on the part of health professionals and members of the general public, many of whom consider themselves sleep deprived.

Monday, April 20, 2009

Kids Like Fruits and Veggies When Given a Chance

The good nutrition news is that children in poor, rural parts of the Lower Mississippi Delta are a lot more willing to try fresh fruits and vegetables than generally believed, even by their parents or the kids themselves. The bad news is that such foods are often in short supply in an area where gas stations and convenience stores are the closest places to buy food and where growing family gardens has given way to long work commutes by parents – and that the situation is growing worse with a worsening economy.

Two presentations drawing from a multi-year nutrition research program in Delta summer camps and schools were presented on April 19 at the Experimental Biology 2009 meeting in New Orleans as part of the scientific program of the American Society for Nutrition. The ongoing research program is being conducted under the direction of research nutritionist Dr. Beverly McCabe-Sellers, US Department of Agriculture/Agricultural Research Service, Little Rock, Arkansas, and is part of the Delta Obesity Prevention Research Unit (OPRU) headed by Executive Director Dr. Margaret Bogle.

The research arm of the Delta OPRU works with local communities to understand obstacles to better nutrition in the Lower Delta (including rural parts of Arkansas, Louisiana and Mississippi), which leads the nation in the rising prevalence of obesity in both adults and children.

The challenge to having more fruits and vegetables in the diets of youngsters is not their unwillingness, she says, nor is it necessarily the admittedly low income in the area. Potato chips are not inexpensive, but the children often had small bags of them for every meal. The largest challenge, she believes from her experience, is the difficulty in obtaining quality fresh produce at a reasonable cost in these rural areas far away from distribution centers.

Saturday, April 18, 2009

Epidermal Growth Factor Receptor Found for Pancreatic Cancers

Finally some promising news about pancreatic cancer, one of the most fatal cancers, due to the difficulties of early detection and the lack of effective therapies: Johns Hopkins University pathologist Akhilesh Pandey has identified an epidermal growth factor receptor aberrantly active in approximately a third of the 250 human pancreatic cancers studied.

In a presentation April 18, at Experimental Biology 2009 in New Orleans, Dr. Pandey explained why this finding and related work in his Hopkins laboratory is promising in terms of both a new treatment for a large subset of pancreatic cancers and a potential blood or urine screening tool that might eventually do for pancreatic cancer detection what biomarkers like prostate-specific antigen levels have done for prostate cancer. His presentation was part of the scientific program of the American Society for Investigative Pathology.

Personalized treatment. Phosophorylated epidermal growth factor receptor (pEGFR), the receptor identified by Dr. Pandey, is closely related to HER-2, a growth factor receptor found and used as a drug target in a subset of breast cancers. After he found and profiled the pEGFR activated in the pancreatic cancers, Dr. Pandey realized the same receptor had been found by other researchers to be activated in a subset of lung cancers. And, most promising, an EGFR inhibitor named erlotinib already has been through the long and complex Food and Drug Administration approval process and is in use for treatment of these specific lung cancers.

But would the drug work in pancreatic cancers? Dr. Pandey’s group moved from studies of human cell lines to studies in mice in which human pancreatic tumor cells with activated EGFT had been placed. The tumors began growing. But when treated with erlotinib, they began to shrink. Other tumors without activated pECFR showed no response.

The promise – and the challenge – of using pEGFR is that of personalized medicine, says Dr. Pandey. Obviously a growth factor receptor that is activated only in a subset of all pancreatic cancers cannot be a one-size-fits-all target for treatment. Earlier studies in other laboratories and clinical trials already had tried EGF inhibitors as a treatment for pancreatic cancer and concluded that they did not work. When Dr. Pandey’s collaborators allowed them to re-examine their samples, they found that the only case in 12 cases that had responded to the EGF inhibitor was the only case with an activated EGF receptor. Dr. Pandey would like to see other researchers go back and re-analyze their data, separating patients with and without the activated receptor, and then determining the success rate. He believes it would tell a different, more hopeful story.

Screening for pancreatic cancer. Dr. Pandey’s other goal in his research is to use mass spectrometry to find additional markers of pancreatic cancer in the tumors themselves but also in blood and urine, which would avoid the problems of invasive biopsies. As a first step, his team has gone through the scientific literature to create a compendium of several hundred proteins and genes reported to be overexpressed in pancreatic cancers, making them excellent candidates for further study. The compendium already is being used by a consortium of investigators who are developing antibodies against the 60 most promising targets.

Tuesday, March 17, 2009

Brain Waves Synchronicity

Scientific American continues to produce the best coverage of science and the mind. The story on musicians and how they sync efforts is interesting. Thank you to Movietome Beta for the image of the album by The Police called Synchronicity.

I like the description on Wikipedia on synchronicity: Synchronicity is the experience of two or more events which are causally unrelated occurring together in a supposedly meaningful manner. In order to count as synchronicity, the events should be unlikely to occur together by chance. The concept does not question, or compete with, the notion of causality. Instead, it maintains that just as events may be grouped by cause, they may also be grouped by their meaning. Since meaning is a complex mental construction, subject to conscious and subconscious influence, not every correlation in the grouping of events by meaning needs to have an explanation in terms of cause and effect.

Jordan Lite's 60-Second Science blog, says, "Ever wonder how musicians manage to play in unison? Credit their brain waves: they synchronize before and while musicians play a composition, according to new research. German scientists report in BMC Neuroscience that they measured the brain waves of eight pairs of guitarists using electroencephalography (EEG) while they played a modern jazz piece called Fusion #1 (by Alexander Buck). The researchers found that the guitarists' brain waves were aligned most during three pivotal times: when they were syncing up with a metronome, when they began playing the piece and at points during the composition that demanded the most synchrony."

Saturday, January 24, 2009

Intellectual Property Rights - Legal Stays Busy

Since I work in the medical discovery world I like to keep up with the business side of innovation, and this one hits home on a big issue of intellectual property rights for the new century.

Newsweek's Michael Heller covers the troubles in "Innovation Gridlock- Today's inventors need to put together many bits of intellectual property. Too bad they are all patented."

[Image from Vaugn Merlyn]

Newsweek writes, the first decade of the 21st Century has seen startling advances in biology. Scientists have cracked the genomes of humans and many plants, animals and microbes. They've uncovered new cellular processes affecting inheritance of diseases. Likewise, investment in biotech research and development has been steadily increasing. So what happened to all the lifesaving cures that were supposed to come our way as a result?

Saturday, January 10, 2009

No Doubt Facinating - the Life of a Savant

Scientific American is providing an interesting read this week with an interview with Daniel Tammet, a person SA says is an autistic savant. Read more. Also, while looking I came across this doctor who studies savants: Darold Treffert. He discusses Tammet here and many savants here. Photo credit.

Evidently the world has been aware of Tammet since 2004 when he one the Pi contest -Tammet's web site.

Good quote: "My brain has developed a little differently from most other people’s. Aside from my high-functioning autism, I also suffered from epileptic seizures as a young child. In my book, I propose a link between my brain’s functioning and my creative abilities based on the property of ‘hyper-connectivity’. "

Daniel Tammet is the author of two books, Born on a Blue Day and Embracing the Wide Sky, which comes out this month. He’s also a linguist and holds the European record for reciting the first 22,514 decimal points of the mathematical constant Pi. Mind Matters editor Jonah Lehrer chats with Tammet about how his memory works, why the IQ test is overrated, and a possible explanation for extraordinary feats of creativity.

LEHRER: Your recent memoir, Born on a Blue Day, documented your life as an autistic savant. You describe, for example, how you are able to quickly learn new languages, and remember scenes from years earlier in cinematic detail. Are you ever surprised by your own abilities?

TAMMET: I have always thought of abstract information—numbers for example—in visual, dynamic form. Numbers assume complex, multi-dimensional shapes in my head that I manipulate to form the solution to sums, or compare when determining whether they are prime or not. For languages, I do something similar in terms of thinking of words as belonging to clusters of meaning so that each piece of vocabulary makes sense according to its place in my mental architecture for that language. In this way I can easily discern relationships between words, which helps me to remember them. In my mind, numbers and words are far more than squiggles of ink on a page. They have form, color, texture and so on. They come alive to me, which is why as a young child I thought of them as my “friends.” I think this is why my memory is very deep, because the information is not static. I say in my book that I do not crunch numbers (like a computer). Rather, I dance with them. None of this is particularly surprising for me. I have always thought in this way so it seems entirely natural. What I do find surprising is that other people do not think in the same way. I find it hard to imagine a world where numbers and words are not how I experience them!

Saturday, December 27, 2008

Finding Science Instruction on the Internet

You knew it was just a matter of time until the Internet provided intellectual content at a level an industrious amatuer scientist could fiddle with. In Newsweek, an AP reporter Marcus Wohlsen writes about this endeavor.

The prospects could have major implications for NIH, major pharma, universities, and more. How will the money flow and what will the standards be in years to come?

Read more at Newsweek: "The Apple computer was invented in a garage. Same with the Google search engine. Now, tinkerers are working at home with the basic building blocks of life itself.
Using homemade lab equipment and the wealth of scientific knowledge available online, these hobbyists are trying to create new life forms through genetic engineering — a field long dominated by Ph.D.s toiling in university and corporate laboratories."
Thanks to Ingenuity Works for the image.

Friday, November 28, 2008

Hawking Continues his Universe Quest

If anyone is looking for a hero, you can start with Stephen Hawking. News today says Stephen Hawking will become the first distinguished research chair at Canada’s leading scientific trust, the Perimeter Institute for Theoretical Physics in Waterloo, Ontario. Hawking will make regular visits to the institute, which focuses on quantum theory and gravity, beginning next summer. He will continue to hold his position as a professor of mathematics at Cambridge University.

Besides the fact that Hawking is brilliant, he is an amazing person for his perserverence against his disability from ALS. He says, "I am quite often asked: How do you feel about having ALS? The answer is, not a lot. I try to lead as normal a life as possible, and not think about my condition, or regret the things it prevents me from doing, which are not that many."

His web site says, "Hawking has worked on the basic laws which govern the universe. With Roger Penrose he showed that Einstein's General Theory of Relativity implied space and time would have a beginning in the Big Bang and an end in black holes. These results indicated it was necessary to unify General Relativity with Quantum Theory, the other great scientific development of the first half of the 20th Century. One consequence of such a unification that he discovered was that black holes should not be completely black, but should emit radiation and eventually evaporate and disappear. Another conjecture is that the universe has no edge or boundary in imaginary time. This would imply that the way the universe began was completely determined by the laws of science.

"His many publications include The Large Scale Structure of Spacetime with G F R Ellis, General Relativity: An Einstein Centenary Survey, with W Israel, and 300 Years of Gravity, with W Israel. Stephen Hawking has three popular books published; and his best seller A Brief History of Time."

Saturday, October 18, 2008

How Does an Iconoclast Think?

I like to cover stories about innovation on my personal blog, The Sky Badge Project, but I think this has interesting scientific merit so I am posting two places.

From an Emory University press release we learn about a new book: Iconoclast: A Neuroscientist Reveals How to Think Differently (Harvard Business Press, 2008) - Gregory Berns, MD, PhD, shows us how the world's most successful innovators think and what we can learn from them.

Berns is distinguished chair of neuroeconomics, professor of economics at Emory University, and professor of psychiatry and behavioral sciences, Emory University School of Medicine. He focuses his research on human motivation and decision-making through a blend of neuroscience, economics and psychology.

"Iconoclasts are individuals who do things that others say can't be done," explains Berns. "An iconoclast defies the rules, but given the opportunity, can be an asset to any organization because of the skill to be creative and innovative despite adversity."

The book examines the stories of famous and not-so-famous iconoclasts to learn something about creative decision-making, innovation and creativity and the ability to control fear, and to look at the neuroscience behind those processes. Berns profiles people such as Walt Disney, the iconoclast of animation; Natalie Maines, an accidental iconoclast; and Martin Luther King, who conquered fear.

Berns says that many successful iconoclasts are made not born. For various reasons, they simply see things differently than other people do.

"Certainly there are people who are born this way, but what I have been able to learn about these individuals is that most successful iconoclasts are people who are skilled at handling failure and particularly at handling fear - fear of failure, fear of the unknown," says Berns.
He also discovered a trait that ultimately distinguishes the people who are really successful is social intelligence.

"A person can have the greatest idea in the world - completely different and novel - but if that person can't convince enough other people, it doesn't matter," says Berns.

Friday, August 22, 2008

Pluses for HRT in Postmenopausal Women

American women can stay confused about hormone replacement for postmenopausal health with all of the reports talking about its benefits, but then warning of its harm.

Here is the latest news from a Eurekalert press release reporting on a study in the British Medical Journal. The photo comes from JAMD.

One of the world's longest and largest trials of hormone replacement therapy (HRT) has found that post-menopausal women on HRT gain significant improvements in quality of life.

The results of the latest study by the WISDOM research team (Women's International Study of long Duration Oestrogen after Menopause) are published today on the British Medical Journal website http://www.bmj.com/.

The study involved 2130 post-menopausal women in the UK, Australia and New Zealand, and assessed the impact of combined oestrogen and progestogen hormone therapy on the women's quality of life. The average age of women in this study was 13 years after menopause and most participants did not have menopausal symptoms.

"Our results show that hot flushes, night sweats, sleeplessness and joint pains were less common in women on HRT in this age group. Sexuality was also improved," says Professor Alastair MacLennan, leader of the Australian arm of WISDOM and head of Obstetrics & Gynaecology at the University of Adelaide, Australia.

"Overall, quality of life measures improved. Even when women did not have hot flushes and were well past menopause, there was a small but measurable improvement in quality of life and a noted improvement in sleep, sexuality and joint pains. HRT users also had more breast tenderness and discharge compared to those on a placebo," he says.

Dr Beverley Lawton, Head of WISDOM New Zealand, says: "These new data should be added to the risk/benefit equation for HRT. The quality of life benefits of HRT may be greater in women with more severe symptoms near menopause. New research suggests that HRT taken from near menopause avoids the cardiovascular risks seen when HRT is initiated many years after menopause."

Professor MacLennan says studies such as those conducted by WISDOM "enable the risks of HRT to be reduced and its benefits maximized when the treatment is individualized to each woman".

"Early start-up side effects can usually be alleviated by adjusting the treatment," he says. "For most women with significant menopause symptoms the benefits of HRT outweigh the risks. The latest analyses of the main long-term randomized control trial of HRT (The Women's Health Initiative) show that breast cancer is not increased by estrogen-only HRT and is only increased in women using combined oestrogen and progestogen HRT after seven years of use. This increased risk is less than 0.1% per year of use.

"If a woman feels that HRT is needed for quality of life, then doctors can find the safest regimen for her. She can try going off HRT every 4-5 years, and can then make an informed choice about whether she takes and continues HRT."

Saturday, July 12, 2008

Gamma-Ray Bursts Give Awesome Afterglow

I have been enjoying the Scientific American web site today, and always take a look at the physics section - written to help a non-physicist get it! I wanted to put the spectacular image in my blog, with credit, but I am not sure if this is allowed. So visit the story to see it! Instead I have used an image I found on Google and credit goes to scubagrl.

Writer JR Minkel says, "A new study casts doubt on a long-standing belief about the power behind gamma-ray bursts, the most energetic explosions in the universe. Researchers have found that short gamma-ray bursts—those that last a couple of seconds or less—have brighter afterglows than the simple, reigning model of afterglow emission predicts. Gamma-ray bursts (GRBs) are believed to occur when a star that has collapsed into a black hole or a neutron star whips a disk of gas and dust into a pair of powerful jets moving at nearly light speed. Like a lighthouse in fog, these so-called relativistic jets should cause whatever gas and dust that enshrouds the GRB source to glow brightly for hours after the burst's initial flash of energy."

Sunday, June 29, 2008

North Pole's Changes Bring Grim News

The headline in TIME really caught my eye because it was a big surprise even with all the news about ice at the earth's poles: An Ice-Free North Pole?

TIME writer Seth Borenstein says a scientist he talked with notes, "There's a 50-50 chance that the North Pole will be ice-free this summer, which would be a first in recorded history..... Preliminary February and March data from a NASA satellite shows that the circle of ice surrounding the North Pole is "considerably thinner" than scientists have seen during the five years the satellite has been taking pictures.... For the last couple of decades, there has been a steady melt of Arctic sea ice — which covers only the ocean and which thins during summer and refreezes in winter. In recent years, it has gradually become thinner because more of it has been melting as the Earth's temperature rises."

Of course, scientists are looking for solutions, but how could it possibly be in time to reverse these dramatic and fast-moving changes?