Did America Forget How to Make the H-Bomb?

From Mother Jones:

For decades nonproliferation experts have argued that, once unleashed, the nuclear genie cannot be stuffed back in the bottle. But they probably didn't consider the possibility that a country with nuclear bomb-making know-how might forget how to manufacture a key atomic ingredient. Yet that's precisely what happened to the US recently, and national security experts say this institutional memory lapse raises serious questions about the federal government's nuclear weapons management.

In 2007, as the government began overhauling the nation's stockpile of W76 warheads—the variety often carried by Ohio-class submarines—officials at the National Nuclear Security Administration realized they couldn't produce an essential material known as "Fogbank." What purpose this substance actually serves is classified, but outside experts have suggested that it's a sort of exploding foam that sits between the fission and fusion portions of hydrogen bombs. The Government Accountability Office reported in March that NNSA's effort to recover its Fogbank-making ability had resulted in a yearlong, $69 million delay in the refurbishment project. And a government official with knowledge of the situation tells Mother Jones that further Fogbank-related delays are imminent.

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How Nanotech Can Meet The Poor's Water Needs

From SciDev.net:

Nanotechnology holds huge potential for supplying clean water to the world's poor, but many challenges must be overcome to realise it.

When the economist Fritz Schumacher coined the phrase "small is beautiful" more than 30 years ago, he was hoping to promote "intermediate technologies" that focus on local techniques, knowledge and materials, rather than high-tech solutions to problems facing the world's poor.

But more recently, the phrase has taken on a different meaning as scientists and engineers develop nanotechnology — processes to control matter at an atomic or molecular level — and show that this field, too, can promote sustainable development.

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The Frontiers of Astronomy

From Discover Magazine:

DISCOVER's panel of top astronomers and astrophysicists discuss some of the biggest questions in the universe.

What lies beyond the edge of the solar system? Does life exist on other planets? Why is the universe constructed the way it is? Drawing on new insights and technologies, scientists are probing these unknowns in ways that were unimaginable just a few years ago. This month, DISCOVER presents a three-part investigation of the astonishing results. First up: In conjunction with the National Science Foundation, Caltech, and the Thirty Meter Telescope, DISCOVER brought together four leading astronomers to describe their studies of wayward comets, alien worlds, black holes, and the expanding universe. The panel discussion was held at Caltech’s Beckman Auditorium and moderated by DISCOVER’s Bad Astronomy blogger, Phil Plait. The four-part video from the panel is included in the two-page article below; to see video interviews with the four panelists, see the homepage for the event.

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Our Planet's Leaky Atmosphere

Photo: Loss of certain gases, especially hydrogen, has transformed Earth. It is one of the reasons that oxygen built up in the atmosphere. In the future, the depletion of hydrogen will dry out our oceans and all but shut down geologic cycles that stabilize the climate. Life may still be able to hold out in the polar regions. Earth past: 3 billion years ago (left) Earth present (center) Earth future: 3 billion years from now (right) Alfred T. Kamajian

From Scientific American:

As Earth's air slowly trickles away into space, will our planet come to look like Venus?

Key Concepts

* Many of the gases that make up Earth’s atmosphere and those of the other planets are slowly leaking into space. Hot gases, especially light ones, evaporate away; chemical reactions and particle collisions eject atoms and molecules; and asteroids and comets occasionally blast out chunks of atmosphere.
* This leakage explains many of the solar system’s mysteries. For instance, Mars is red because its water vapor got broken down into hydrogen and oxygen, the hydrogen drifted away, and the surplus oxygen oxidized—in essence, rusted—the rocks. A similar process on Venus let carbon dioxide build up into a thick ocean of air; ironically, Venus’s huge atmosphere is the result of the loss of gases.

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Mars Rover May Not Escape Sand Trap For Weeks

Photo: Engineers will try to recreate the terrain that Spirit is stuck in at NASA's Jet Propulsion Laboratory in California, where similar tests were performed in 2005 (above) to help extricate Opportunity from a sand trap (Image: NASA/JPL)

From New Scientist:

NASA's Spirit Mars rover is so deeply stuck in the sand that its belly may be resting on underlying rocks, which could hamper efforts to extricate it. Mission members say it will probably take weeks before they make any headway in freeing the rover.

Spirit began to have trouble driving around 1 May, says John Callas, the rover project manager at NASA's Jet Propulsion Laboratory in Pasadena, California.

Its wheels are now buried about halfway in the soil, which is so loose "it's like flour", says Callas. Mission managers have temporarily stopped trying to drive the rover as they consider how best to proceed.

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Swine Flu Data 'Very Consistent' With Early Stages Of A Pandemic

Swine flu data so far is very consistent with what researchers would expect to find in the early stages of a pandemic. (Credit: iStockphoto/Henrik Jonsson)

From Science Daily:

ScienceDaily (May 12, 2009) — Early findings about the emerging pandemic of a new strain of influenza A (H1N1) in Mexico are published in the journal Science.

Researchers from the MRC Centre for Outbreak Analysis and Modelling at Imperial College London, working in collaboration with the World Health Organisation and public health agencies in Mexico, have assessed the epidemic using data to the end of April. Their key findings are as follows:

* The data so far is very consistent with what researchers would expect to find in the early stages of a pandemic.

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Powerful Ideas: Fusing Atoms Just Might Work

Artist's rendering of a NIF target pellet being struck by multiple laser beams, which inside compress and heat the target to the necessary conditions for nuclear fusion to occur. Credit: Lawrence Livermore National Laboratory, and the Department of Energy

From Live Science:

This occasional series looks at powerful ideas — some existing, some futuristic — for fueling and electrifying modern life.

Solar power captures sunlight to create renewable energy, but recreating the sun on Earth holds even greater energy potential. Nuclear fusion — the power source inside the sun — will be attempted in new and soon-to-be-built facilities around the world.

"Fusion is a carbon-free and a virtually limitless supply of energy," said Ed Moses, project manager for the Department of Energy's recently commissioned National Ignition Facility (NIF) in Livermore, Calif.

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Bad Luck Bimbos: Intelligent Women Have Better Sex, Study Reveals

From Daily Mail:

Beauty may bag you a man - but brains will bring you more fun in the bedroom.

Women blessed with 'emotional intelligence' - the ability to express their feelings and read those of others - have better sex lives, research shows.

Those most in touch with their feelings have twice as many orgasms as inhibited sorts, the study found.

The finding could lead to new ways of counselling the 40 per cent of women who find it difficult or impossible to enjoy sex fully.

Researcher Tim Spector of King's College London said there were definite advantages to being a touchy-feely type.

He said: 'These findings show that emotional intelligence is an advantage in many aspects of your life, including the bedroom.'

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The Truth Is Out There, And The Nation's Maddest Scientists Are After It

From Wired:

Paranormal phenomena aren't just for Fox Mulder, Melinda Gordon, and Rod Serling. Even top academics can't resist a good ghost story. And maybe that's for the better: Brilliant ideas often seem crazy at first. Scientific American dubbed the Wright Brothers "the Lying Brothers" despite test flights witnessed by trainloads of startled onlookers. More obscure findings can fare worse: Germs, quarks, black holes, and continental drift were all once considered laughable. Still, impeccably credentialed scientists persist, as Lewis Carroll's White Queen says, in trying to believe a few impossible things before breakfast—or after they've received tenure.

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Planck: The Future Of Probing The Past

Photo: The Planck satellite will enable us to find out what happened just fractions of a second after the big bang (Image: Plnck / LBNL / SSC)

From The New Scientist:

WE ARE poised to peer further back in time than ever before. Next week, cosmology's biggest experiment in nearly a decade is due to blast into space. The European Space Agency's Planck satellite will enable us to find out what happened just fractions of a second after the big bang, when the universe is thought to have blown up to cosmic proportions from a speck of space-time.

The probe, which is fuelled and ready for launch in French Guiana, will examine in exquisite detail the cosmic microwave background (CMB), the relic radiation of the big bang. It is "like a surgical instrument", says Andrei Linde of Stanford University.

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The Day The Universe Froze: New Model For Dark Energy

The ultimate fate of the universe depends on the exact nature of dark energy. Depending on its properties, the universe may fly apart (the big rip) or the current expansion might reverse into contraction (the big crunch) or anything in between. (Credit: NASA/CXC/M. Weiss)

From Science Daily:

ScienceDaily (May 11, 2009) — Imagine a time when the entire universe froze. According to a new model for dark energy, that is essentially what happened about 11.5 billion years ago, when the universe was a quarter of the size it is today.

The model, published online May 6 in the journal Physical Review D, was developed by Research Associate Sourish Dutta and Professor of Physics Robert Scherrer at Vanderbilt University, working with Professor of Physics Stephen Hsu and graduate student David Reeb at the University of Oregon.

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Shuttle Atlantis Blasts Off On List Hubble Mission

The space shuttle Atlantis lifts off Monday May 11, 2009 at the Kennedy Space Center in Cape Canaveral, Fla. Seven astronauts are beginning a 12-day mission that includes the fifth and final servicing of the Hubble Space Telescope. (AP Photo/Chris O'Meara)

From Yahoo News/AP:

CAPE CANAVERAL, Fla. – Space shuttle Atlantis and a crew of seven thundered away Monday on one last flight to the Hubble Space Telescope, setting off on a daring repair mission that NASA hopes will lift the celebrated observatory to new scientific heights.

Atlantis rose from its seaside pad about 2 p.m. and arced out over the Atlantic, ducking through clouds. The Hubble was directly overhead, 350 miles up.

For the first time ever, another shuttle was on a nearby launch pad, primed for a rescue mission if one is needed because of a debris strike.

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Is Hubble Worth The Upgrade Mission's Risk And Cost?

This new Hubble image of the Orion Nebula shows dense pillars of gas and dust that may be the homes of fledgling stars, and hot, young, massive stars that have emerged from their cocoons and are shaping the nebula with powerful ultraviolet light. Credit: NASA, ESA, M. Robberto (Space Telescope Science Institute/ESA) and the Hubble Space Telescope Orion Treasury Project Team

From Live Science:

Years ago, you could walk into any bar and ask the crowd to name a telescope, and they'd likely respond with a Cheers-like-greeting-to-Norm, "Hubble!" Not sure why you'd want to do that, but if you want to try it today, it'll still work. No telescope has ever engaged the public imagination so effectively.

After an eye operation to fix its blurred vision in 1993, Hubble has been sending back gorgeous, scientifically priceless images that have become NASA's best publicity, the most tangible and colorful justification for a space agency that spends billions on less glamorous endeavors such as circling the Earth for decades in shuttles and the space station.

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Stephen Wolfram Reveals Radical New Formula For Web Search

From Wired:

The home page is nearly blank. At the center, just below a colorful logo, you’ll find an empty data field. Type in a phrase, hit Return, and knowledge appears.

No, it’s not Google. It’s Wolfram|Alpha, named after its creator, Stephen Wolfram, a 49-year-old former particle physics prodigy who became bewitched by the potential of computers. He invented a powerful computational software program (Mathematica), built a company around it (Wolfram Research), and wrote a massive book (A New Kind of Science) that claims to redefine the universe itself in terms of computation.

So when Wolfram asked me, “Do you want a sneak preview of my most ambitious and complex project yet?” he had me at “Do.”

The product of four years of development, Alpha is an engine for answers. Its ambition is to delve into “all the knowledge in the world,” Wolfram says, to find and calculate information. Though Alpha’s interface evokes Google ― whose co-founder Sergey Brin once spent a summer interning for Wolfram ― it’s more like the anti-Google.

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Hubble Telescope Mission, Nasa's Most Dangerous Endeavour, Is Ready For Launch

From The Daily Mail:

Nasa is set to dispatch seven astronauts on its most dangerous ever shuttle mission as it attempts to rescue the $7 billion Hubble Space Telescope from meltdown.

Led by former US Navy fighter pilot Scott Altman, 49, a one-time stunt flier for actor Tom Cruise in the film Top Gun, the crew of Atlantis will repair and upgrade the orbiting observatory, risking a potentially deadly space-junk collision that could leave them stranded 350 miles above Earth.

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Brain Has "Moving" Parts

From Scientific American:

A study in the journal Science reveals that the brain region responsible for the intention to move the body also experiences the movement--but a distinct brain region controls the actual movement. Karen Hopkin reports.

[The following is an exact transcript of this podcast.]

For every action, there’s a reaction. And for many movements we make, there’s an intention: we think about moving, and we move. Now a study published in the May 8th issue of the journal Science suggests that the experience of moving is all in your mind. Because the part of the brain that’s active when you intend to move is the same part that lets you feel like you did.

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Out Of Africa, The Tribe That Populated The World... Thanks To Climate Change

Olduvai Gorge in the Rift Valley, Tanzania, is often referred to as the cradle of humankind

From The Daily Mail:

Human life outside Africa can be traced to a tribe of 200 people who crossed the Red Sea after climate change made their journey possible.

Falling sea levels allowed the small band to venture across to Arabia 70,000 years ago, a BBC2 documentary claims.

Their descendants then continued the journey that culminated in the colonisation of the world.

Presenter Dr Alice Roberts said it appeared that modern man had a climate change - and luck - to thank for his success.

She said: 'People ask why did man migrate out of Africa at that point? Had they developed a new way of life or particular abilities and attributes?

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Solar Cycle Will Be Weakest Since 1928, Forecasters Say

The sun is thought to have reached the lowest point in its activity in December 2008, but the new solar cycle has gotten off to a slow start. This week, however, two active regions (bright regions in upper-left corner) - whose knotty magnetic fields often coincide with eruptions and flares - appeared on the far side of the sun. One of NASA's twin STEREO probes snapped this image on Thursday (Image: NASA/Goddard Space Flight Center)

From New Scientist:

The sun's new solar cycle, which is thought to have begun in December 2008, will be the weakest since 1928. That is the nearly unanimous prediction of a panel of international experts, some of whom maintain that the sun will be more active than normal.

But even a mildly active sun could still generate its fair share of extreme storms that could knock out power grids and space satellites.

Solar activity waxes and wanes every 11 years. Cycles can vary widely in intensity, and there is no foolproof way to predict how the sun will behave in any given cycle.

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World’s Oldest Manufactured Beads Are Older Than Previously Thought

Archaeologists have uncovered some of the world's earliest shell ornaments. (Credit: Image courtesy of University of Oxford)

From Science Daily:

ScienceDaily (May 7, 2009) — A team of archaeologists has uncovered some of the world’s earliest shell ornaments in a limestone cave in Eastern Morocco. The researchers have found 47 examples of Nassarius marine shells, most of them perforated and including examples covered in red ochre, at the Grotte des Pigeons at Taforalt.

The fingernail-size shells, already known from 82,000-year-old Aterian deposits in the cave, have now been found in even earlier layers. While the team is still awaiting exact dates for these layers, they believe this discovery makes them arguably the earliest shell ornaments in prehistory.

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Increased Food Intake Alone Explains Rise In Obesity In United States, Study Finds

New research finds that the rise in obesity in the United States since the 1970s was virtually all due to increased energy intake. (Credit: iStockphoto/Michael Krinke)

From Science Daily:

ScienceDaily (May 8, 2009) — New research that uses an innovative approach to study, for the first time, the relative contributions of food and exercise habits to the development of the obesity epidemic has concluded that the rise in obesity in the United States since the 1970s was virtually all due to increased energy intake.

How much of the obesity epidemic has been caused by excess calorie intake and how much by reductions in physical activity has been long debated and while experts agree that making it easier for people to eat less and exercise more are both important for combating it, they debate where the public health focus should be.

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