Science & Technology
Long-distance atmospheric connections between the North and South poles are linking weather and climate in distant parts of the globe, according to data from a NASA spacecraft.
These so-called "teleconnections" explain why the winter air temperature in Indianapolis, Ind., during the so-called polar vortex correlated with a reduction in high-altitude clouds over Antarctica, thousands of miles away, researchers say.
"Changes in the polar regions in the North were 'communicated' all the way over to the other side of the globe," said Cora Randall, an atmospheric scientist at the University of Colorado, Boulder and a member of the Aeronomy of Ice in the Mesosphere (AIM) spacecraft's science team.
© Kavli IPMU
Artist's conception of Type Ia Supernova.
Artist's conception of Type Ia Supernova.
Now, the same team of researchers, led by Robert Quimby, of the University of Tokyo's Kavli Institute for the Physics and Mathematics of the Universe, said the exceptionally bright supernova they reported in 2013 is so luminous because a lens in the sky amplified its light. The discovery settles an important controversy in the field of astronomy.
"PS1-10afx is like nothing we have seen before," said Quimby.
Its exceptional glow was very puzzling, leading some to conclude it was a new type of extra-bright supernova, while others suggested it was a normal SNIa magnified by a lens in the form of a massive object, such as a nearby supermassive black hole.
"The team that discovered it," Quimby said, "proposed that it was a new type of supernova, one that no theory predicted."
The PS1-10afx supernova is 30 times brighter than any supernova found before it and the research team now say this SNIa is the first example of strong gravitational lensing of a supernova, confirming the team's previous explanation for the unusual properties of this supernova.
The team's research has further shown that such discoveries of SNIa can be made far more common than previously thought possible.
© Gary Meek/Georgia Tech
In the midst of airborne sea salt and dust, researchers from Georgia Tech unexpectedly found thousands of living fungal cells and bacteria, including E. coli and Streptococcus.
In the midst of airborne sea salt and dust, researchers from Georgia Tech unexpectedly found thousands of living fungal cells and bacteria, including E. coli and Streptococcus.
Now what?
Scientists don't yet know what the bacteria are doing up there, but they may be essential to how the atmosphere functions, says Kostas Konstantinidis, an environmental microbiologist on the Georgia Tech team. For example, they could be responsible for recycling nutrients in the atmosphere, like they do on Earth. And similar to other particles, they could influence weather patterns by helping clouds form. However, they also may be transmitting diseases from one side of the globe to the other. The researchers found E. coli in their samples (which they think hurricanes lifted from cities), and they plan to investigate whether plagues are raining down on us. If we can find out more about the role of bacteria in the atmosphere, says Ann Womack, a microbial ecologist at the University of Oregon, scientists could even fight climate change by engineering the bacteria to break down greenhouse gases into other, less harmful compounds.
© Sean Parker
The Milky Way arches over an old windmill near Paulden, Arizona.
The Milky Way arches over an old windmill near Paulden, Arizona.
It may seem odd that a comprehensive understanding of the Milky Way's structure has so far eluded researchers. But it's tough to get a broad view of the galaxy from within.
"We are fairly confident that the Milky Way is a spiral galaxy, but we don't know much in detail. At the most basic level, we'd like to be able to make a map that would show in detail what it looks like," said Mark Reid of the Harvard-Smithsonian Center for Astrophysics, who led the new study.
Lots more where that came from
It took a space rock the size of San Francisco to finish off the dinosaurs 65 million years ago, but a decent-sized metropolis could be reduced to smoldering ruins by a boulder that could fit inside a soccer field. The strike rate for such large space rocks, properly known as asteroids, has been estimated at once every 3,000 years, but the B612 Foundation, a planetary defense group, says the true figure could be as high as once a century. Outside scientists say that frequency is plausible but could well be too high.
"There are people who say, 'Oh, once every million years we have something we have to worry about.' That couldn't be more wrong," says physicist and former space shuttle astronaut Ed Lu, chief executive officer of the B612 Foundation. "Eventually you're going to get hit, because it's just a matter of time."
© Reuters / Nacho Doce
People hold a banner protesting against surveillance on the Internet during the NETmundial: Global Multistakeholder Meeting on the Future of Internet Governance in Sao Paulo April 23, 2014
People hold a banner protesting against surveillance on the Internet during the NETmundial: Global Multistakeholder Meeting on the Future of Internet Governance in Sao Paulo April 23, 2014
The bill known as the "Internet constitution" or Marco Civil was first introduced in the wake of the NSA spying scandal and has now been signed into law by President Dilma Rousseff - one of the primary targets of the US intelligence apparatus, as leaks by former NSA analyst Edward Snowden revealed.
Rousseff presented the law on Wednesday at a global Net Mundial Internet conference in Sao Paulo.
You probably thought you learned all the shapes - your circles, your squares, your triangles and rhombi - sometime in elementary school. You'd be mistaken. Using complex materials such as rubber bands, plastic cups, and paper clips, researchers at Harvard University have just observed and recreated an entirely new shape: the hemihelix.
It's true, you probably won't see the new shape much in nature (if at all), but, just in case, it looks like this:
In fact, it can be recreated fairly easily with some rudimentary materials, which we'll get to in a minute.
Why bother doing something like this at all? Like many things in science, it was kind of an accident. The Harvard team, led by Katia Bertoldi, a professor of applied mechanics, was setting out to try to create a new type of spring. To do that, they were intertwining two different strips of rubber bands that were different lengths and widths. During one of the tests, they accidentally formed a hemihelix, which is like a corkscrew that changes its chirality, or the way it's proverbially screwing, halfway through. Think of it as a if someone put a mirror in the middle of a corkscrew.
It's true, you probably won't see the new shape much in nature (if at all), but, just in case, it looks like this:
© PLOS ONE
Why bother doing something like this at all? Like many things in science, it was kind of an accident. The Harvard team, led by Katia Bertoldi, a professor of applied mechanics, was setting out to try to create a new type of spring. To do that, they were intertwining two different strips of rubber bands that were different lengths and widths. During one of the tests, they accidentally formed a hemihelix, which is like a corkscrew that changes its chirality, or the way it's proverbially screwing, halfway through. Think of it as a if someone put a mirror in the middle of a corkscrew.
© Steven Perrault/Harvard's Wyss Institute
The whole project, outlined in a new paper published at ACS Nano, is pretty bizarre and cool - back in February 2012, researchers at Wyss announced that they had developed a robotic device fashioned out of DNA. They described how one day the tiny devices could be used for targeting specific, undesirable cells within the body.
The DNAbots were shaped like an open barrel whose two halves are closed by a hinge. When the barrel rolls across, say, a leukemia or lymphoma cell, the special DNA latches could recognize the cell-surface proteins, and the two halves of the barrel could swing open to deliver the DNAbot's payload, which could include molecules with encoded instructions that would interact with specific cell surface signaling receptors, all to give the cells the order to self-destruct. That's the idea, anyway.
The approach was already modeled on the seek-and-destroy methods of our body's own white blood cells. However, rather than being flattered by the mimicry, the immune system reacted to the DNA bots in a pretty hostile manner when they were injected into mice. When researchers covered the bots in fluorescent dye and injected them into the rodents' bloodstreams, the bots showed up glowing in their bladders pretty quickly. They were getting caught, filtered, and marked for expulsion.
Mario Livio has written a book entitled Brilliant Blunders. I haven't read the book, but I am intrigued by a review written by Freeman Dyson for the New York Times Review of Books The Case for Blunders. Excerpts:
Science consists of facts and theories. Facts and theories are born in different ways and are judged by different standards. Facts are supposed to be true or false. They are discovered by observers or experimenters. A scientist who claims to have discovered a fact that turns out to be wrong is judged harshly. One wrong fact is enough to ruin a career.
Comment: Yes, most notably financial objectives, which give legs to bad science, carried out by those who have interests in believing wrong theories and twisting the facts.
Climate Science is Zombie ScienceOther relevant links on the fraudulent use of bad theories in the name of 'man-made climate change':
When a branch of science based on incoherent, false or phoney theories is serving a useful but non-scientific purpose it may be kept-going by continuous transfusions of cash from those whose non-scientific interests it serves.
For example, if a branch of pseudo-science based on a phoney theory is nonetheless valuable for political purposes (e.g. to justify a government intervention such as a new tax) or for marketing purposes (to provide the rationale for a marketing campaign) then real science expires and a 'zombie science' evolves.
Zombie science is science that is dead but will not lie down. It keeps twitching and lumbering around so that (from a distance, and with your eyes half-closed) zombie science looks much like real science.
But in fact the zombie has no life of its own; it is animated and moved only by the incessant pumping of funds.
Climate Change Swindlers and the Political Agenda
Video: Al Gore sued by over 30.000 Scientists for fraud
Climategate: Science Is Dying
While climate science is a prime example of science being milked by industry through the policy-makers in its pockets, there are countless other examples where theories and facts are tailored to produce profits to the detriment of people and planet: BigPharma (Vaccines, Statins, countless other products which profit from either manufactured or bought consensus), BigAgro (GMO, pesticides, etc), the Telecoms industry (Wi-fi technology)...
© Andrew Syred/Science Source
Here to stay. The Y chromosome is small compared with the X, but is required to keep levels of some genes high enough for mammals to survive.
Here to stay. The Y chromosome is small compared with the X, but is required to keep levels of some genes high enough for mammals to survive.
"The old textbook description says that once maleness is determined by a few Y chromosome genes and you have gonads, all other sex differences stem from there," says geneticist Andrew Clark of Cornell University, who was not involved in either study. "These papers open up the door to a much richer and more complex way to think about the Y chromosome."
The sex chromosomes of mammals have evolved over millions of years, originating from two identical chromosomes. Now, males possess one X and one Y chromosome and females have two Xs. The presence or absence of the Y chromosome is what determines sex - the Y chromosome contains several genes key to testes formation. But while the X chromosome has remained large throughout evolution, with about 2000 genes, the Y chromosome lost most of its genetic material early in its evolution; it now retains less than 100 of those original genes. That's led some scientists to hypothesize that the chromosome is largely indispensable and could shrink away entirely.
Comment: See more about the possibility of new pathogens arriving on Earth via cometary dust.
New Light on the Black Death: The Cosmic Connection