News Articles

Observations of ice coverage in the Arctic from space began 30 years ago so it's inflammatory to talk about record lows in such a short period of time but two consecutive years near this 'record' still merit some concern.
Because the extent of ice cover is usually at its lowest about mid-September, this year's minimum could still fall and set another record low.
Envisat observations from mid-August depict that a new record of low sea-ice coverage could be reached in a matter of weeks. The animation above is a series of mosaics of the Arctic Ocean created from images acquired between early June and mid-August 2008 from the Advanced Synthetic Aperture Radar (ASAR) instrument aboard Envisat. The dark grey colour represents ice-free areas while blue represents areas covered with sea ice.

Are male Jamaican anole lizards masking some deep insecurity? Overcompensating for small body parts?
Nothing quite that dramatic, though the reason they begin and end the day with displays of reptilian strength, like push-ups, head bobs and extensions of a colorful neck flap, or dewlap, was unknown until recently.
The answer? Nothing more than wanting to defend their territory, according to a new study.
"Anoles are highly visual species, so in that sense it is not surprising that they would use visual displays to mark territory," said Terry J. Ord, a postdoctoral researcher at UC Davis and at Harvard University's Museum of Comparative Zoology. The lizards are the first animals known to mark dawn and dusk through visual displays, rather than the much better known chirping, tweeting, and other sounding off by birds, frogs, geckos and primates.

The geysers of Yellowstone National Park owe their existence to the "Yellowstone hotspot", a region of molten rock buried deep beneath Yellowstone, geologists have found, but how hot is this "hotspot," and what's causing it?
In an effort to find out, Derek Schutt of Colorado State University and Ken Dueker of the University of Wyoming took the hotspot's temperature. They published results in the August, 2008, issue of the journal Geology.
"Yellowstone is located atop of one of the few large volcanic hotspots on Earth," said Schutt. "But though the hot material is a volcanic plume, it's cooler than others of its kind, such as one in Hawaii."

A 75-million-year-old fossil of a pregnant turtle and a nest of fossilized eggs that were discovered in the badlands of southeastern Alberta by scientists and staff from the University of Calgary and the Royal Tyrrell Museum of Palaeontology are yielding new ideas on the evolution of egg-laying and reproduction in turtles and tortoises.
It is the first time the fossil of a pregnant turtle has been found and the description of this discovery was published today in the British journal Biology Letters.
The mother carrying the eggs was found in 1999 by Tyrrell staff while the nest of eggs was discovered in 2005 by U of C scientist Darla Zelenitsky, the lead author of the article and an expert on fossil nest sites, and her field assistant. Both were found about 85 km south of Medicine Hat in the Manyberries area.

New research suggests that preventative agents, such as those found in concentrated black raspberries, may more effectively inhibit cancer development than single agents aimed at shutting down a particular gene.
Researchers at the Ohio State University Comprehensive Cancer Center examined the effect of freeze-dried black raspberries on genes altered by a chemical carcinogen in an animal model of esophageal cancer.
The carcinogen affected the activity of some 2,200 genes in the animals' esophagus in only one week, but 460 of those genes were restored to normal activity in animals that consumed freeze-dried black raspberry powder as part of their diet during the exposure.

A powerful collision of galaxy clusters has been captured with NASA's Chandra X-ray Observatory and Hubble Space Telescope. Like its famous cousin, the so-called Bullet Cluster, this clash of clusters provides striking evidence for dark matter and insight into its properties.
Like the Bullet Cluster, this newly studied cluster, officially known as MACSJ0025.4-1222, shows a clear separation between dark and ordinary matter. This helps answer a crucial question about whether dark matter interacts with itself in ways other than via gravitational forces.

There is a great deal of concern about the effects of global warming on the Greenland ice sheet but scientists at the University of Bristol and the University of Leeds have taken the discussion to a deeper level - namely in stating that only changes in atmospheric carbon dioxide are able to explain the transition from the mostly ice-free Greenland of three million years ago to the ice-covered Greenland of today.
CO2 drops caused Greenland to become ice-covered so CO2 gains could undo that, they say.
There are several competing theories, ranging from changes in ocean circulation, the increasing height of the Rocky Mountains, changes in the Earth's orbit, and natural changes in atmospheric greenhouse gas concentrations. Using state-of-the-art computer climate and ice-sheet models, Dr. Dan Lunt from the University of Bristol and colleagues decided to test which, if any, of these theories was the most credible.

Not all fat is created equal, it seems. A Temple University study finds fat in obese patients is "sick" when compared to fat in lean patients.
Why 'sick? When our bodies don't work properly, we say we're sick. The study in the September issue of Diabetes finds that the same could be said for fat tissue found in obese patients. The cells in their fat tissue aren't working properly and as a result, are sicker than cells found in lean patients' fat tissue.
Lead author Guenther Boden, M.D. theorizes that "sick fat" could more fully explain the link between obesity and higher risk of diabetes, heart disease and stroke.

The latest research into dual-purpose contraceptives and non-hormonal contraception will be presented at the annual scientific conference of the Society for Reproductive Biology (SRB) conference in Melbourne.
University of Newcastle Laureate professor John Aitken, a world-leader in reproductive biology, will discuss the need to develop novel, safe, effective, dual-purpose contraceptive agents that combine the prevention of pregnancy with protection against sexually transmitted diseases (STDs). His research has explored the development of a contraceptive agent that immobilises – but does not kill – sperm. The agent also possesses microbicidal activity simultaneously reducing the risk of infection with sexually transmitted diseases, such as Chlamydia.

'Framing the debate' had its 15 minutes of fame, somewhere early in 2006, and since then has been revealed as little more than another word for 'spin' and, in a new study published in the journal Communication, Culture & Critique, Barbara Barnett of Kansas University lays out how framing was used in the Duke lacrosse players rape allegation.

Despite investments, community goodwill and some good ideas, a vexing question remains in the age of school reform: Why has so much hope and effort led to disappointment?
Beginning in the late 1980s, the Chicago Public Schools, like many urban schools systems, launched a series of initiatives to reorganize schools, improve teaching and encourage parental participation. The changes in Chicago not always have met the expectations of proponents, wrote Charles Payne in his new book, "So Much Reform, So Little Change: The Persistence of Failure in Urban Schools".
The results of national school reform efforts also have led to some disappointment. A lack of trust among teachers and principals and parents frequently creates dysfunction in schools, noted Payne.

Misinterpreted fragments of leg bones, teeth and brow ridges found in Palau appear to be an archaeologist's undoing, according to researchers at three institutions. They say that the so-called dwarfs of these Micronesian islands actually were modern, normal-sized hunters and gatherers.
Scientists from the University of Oregon, North Carolina State University and the Australian National University refute the conclusion of Lee R. Berger and colleagues that Hobbit-like little people once lived there.(1)
"One of his biggest mistakes was rushing to publish," said University of Oregon anthropologist Greg C. Nelson of Berger. "He did not take the time to understand the area in which he was working -- its entire history, not just the skeletal stuff," he said. "Any time you work anywhere, you have to understand this history. You just can't walk in and cowboy it, pull some stuff out and draw conclusions in the absence of understanding the bigger picture."