Sunday, April 30, 2006

Starburst galaxy, Messier 82

Happy Sweet Sixteen, Hubble Telescope!
This mosaic image is the sharpest wide-angle view ever obtained of M82. The galaxy is remarkable for its bright blue disk, webs of shredded clouds, and fiery-looking plumes of glowing hydrogen blasting out of its central regions.

Throughout the galaxy's center, young stars are being born 10 times faster than they are inside our entire Milky Way Galaxy. The resulting huge concentration of young stars carved into the gas and dust at the galaxy's center. The fierce galactic superwind generated from these stars compresses enough gas to make millions of more stars.



M82 - Click for 800×623 image

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Wednesday, April 26, 2006

Cosmic Spider is Good Mother

Cosmic Spider is Good Mother (4/7/06)
The Tarantula nebula is the largest emission nebula in the sky and also one of the largest known star-forming regions in all the Milky Way's neighbouring galaxies. Located about 170,000 light-years away, in the southern constellation Dorado (The Swordfish), it can be seen with the unaided eye.



Tarantula Nebula (NGC 2070) - Click for 1280×1277 image

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Sunday, April 23, 2006

Miscellaneous links, 2006-04-22

Here's where I put interesting stuff I don't have time to write about in detail. Mostly it will be noteworthy Web sites or great articles that stand on their own without further commentary.


The Brain from Top to Bottom
A superb, interactive tutorial on brain structure and function. Covers most important topics, like memory, emotions, and the senses. It offers separate discussions on three different levels: beginner, intermediate, and advanced. Discussions are also classified in terms of level of physical organization (social, psychological, neurological, cellular, and molecular). Each discussion has many internal cross references to others, as well as external links on each page.

Questions and Answers About Avian Flu
Very good set of questions and answers by Denise Grady and Gina Kolata, published March 27, 2006 in the New York Times.

Nanotechnology: CTF Essays, Part 1
This is a press release from the Center for Responsible Nanotechnology, announcing a series of new research papers in which industry experts predict profound impacts of nanotechnology on society. A couple of the authors (Ray Kurzweil and David Brin) will be known to a fairly wide audience. Papers which have already been published are available here, along with forums for online discussion of the topics. (Press release also available here.)

Center for Responsible Nanotechnology
From the site: "The Center for Responsible Nanotechnology is a non-profit research and advocacy organization concerned with the major societal and environmental implications of advanced nanotechnology." Useful content of the site includes issues, external links, nanotech FAQ, glossary, and a blog.

KurzweilAI.net
Kurzweil is, among other things, a futurist. (More about him here or here, if you need it.) Have a look at his Web site if you're interested in any of the following: AI, virtual reality, life extension, nanotechnology, or robotics. (It could take weeks to get through all of it.)

MIT OpenCourseWare
As the name suggests, this is course material, such as syllabi, reading material, and sometimes lecture notes, from actual MIT courses. From the site: "a free and open educational resource for faculty, students, and self-learners around the world." It won't guarantee you'll ace your final in Quantum Field Theory. Or make up for the classes you cut in Developmental Biology. But it may help you learn a little about either of those subjects, and many others, if you haven't had the chance to crack a book on one of them before.

The Hundred Greatest Theorems
As rated by Paul and Jack Abad in 1999. Math grad student Nathan Kahl put the list up on the Web, with links to information about the theroems (when available), as well as links to biographical information on the mathematician credited with proving each theorem. Kahl also has a list of useful math links.

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Monday, April 10, 2006

More about WMAP

I'm planning to write more about the recent WMAP results reported here. But there's actually a lot to say, so I'm going to take it slow and easy. It's hard to overemphasize the importance of some of the issues.

To set the stage in this note, I'm just going to list some of the more important news reports and commentaries that appeared along with, or following, the initial announcement. This is the grist for future reference. There's a lot of repetition, especially in the "news" stories, and much of it is pretty lightweight (which, of course, is a problem). No need to read it all, but if you skim it, you'll have some perspective on what this is all about. What I hope to do, over time, is fill in some of the details and try to explain some of the important issues that are still outstanding.

News reports

Ringside Seat to the Universe's First Split Second (NASA)

New Three Year Results on the Oldest Light in the Universe (NASA)

New Satellite Data On Universe's First Trillionth Second - also here (NASA)

New Satellite Data On Universe's First Trillionth Second (similar to preceding article, NASA)

Scientists Get Glimpse of First Moments After Beginning of Time (NY Times)

Astronomers Find the Earliest Signs Yet of a Violent Baby Universe (later version of preceding article, NY Times)

WMAP Bolsters Case for Cosmic Inflation (Sky & Telescope)

A New Triumph for Inflation (AIP Physics News Update)

Best ever map of the early universe revealed (New Scientist)

Satellite confirms birth theory of universe (Science News)

New direction for cosmic radiation (PhysicsWeb)

Big Bang Afterglow Points to Inflation (ScienceNOW)

Astronomers Detect First Split-Second of the Universe (Space.com)

Evidence for Universe Expansion Found (AP)


Blog comments

New WMAP results: quantum fluctuations, galaxies, and the first stars
Phil Plait at the Bad Astronomy Blog (not a self-descriptive name) offers a very easy, gentle introduction to some of the key concepts relevant to the WMAP science.

WMAP results — cosmology makes sense!
Sean Carroll at Cosmic Variance gives a nice (but rather technical) summary of what's interesting about the results.

Everything I know about the universe I did not learn from newspaper headlines
Sean returns with a shorter summary of the main results, and he adds some mild laments for how the findings were described in press headlines.

WMAP year 3 highlights
Steinn SigurĂ°sson at Dynamics of Cats gives very brief summaries of some of the technical papers.

WMAP for Dummies
Steinn expands nicely on his previous post -- though still assuming much familiarity with the technical background.

WMAP First Impressions
Milligan at EGAD provides a succinct summary of some of the important results. A subsequent post (WMAP: The Cosmic Axis of Evil) calls attention to the possible existence of a suspicious preferred direction in the data. Then he talks about the problem of foreground microwave radiation from our own galaxy. (WMAP: Foregrounds) Finally, he discusses polarization in the CMB. (WMAP: Polarization in the Low-Signal Regime) Altogether, a very nice series.

WMAP results
Jacques Distler at Musings shows a table of some key cosmological parameters and their values implied by WMAP together with other important studies. (For real cognoscenti.)

New WMAP results: first comments
The discussion board CosmoCoffee has a short thread with brief comments from a number of cosmology specialists.

WMAP Results 2006
There's a less technical and more spirited discussion at the Bad Astronomy and Universe Today Forum, with scattered references to other relevant material along the way.

The WMAP 3-year data release
Christine Dantas at Christine's Background Independence provides a summary of the main WMAP results. But more interesting is the rather heated discussion in the comments, especially the questioning of the idea of inflation itself.

Three-year WMAP Data Now Out
Peter Woit at Not Even Wrong provides a few links to NASA releases and some blog comments, which echo some of the issues raised at Christine's blog.

Three-year WMAP data
Scientia est Potentia just lists a few links.



Technical articles

Three Year Science and Instrument Papers (list of technical papers about the WMAP results)

Wilkinson Microwave Anisotropy Probe (WMAP) Three Year Results: Implications for Cosmology (technical explanation of what this is all about, PDF)

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Sunday, April 09, 2006

Surveillance technology

Let's talk about surveillance technology. You know, stuff like wiretapping, data mining, spyware, pervasive surveillance cameras. That sort of thing.

What's raised the issue in my mind is stories like this:

If You're Cheating on Your Taxes...
But a few states, such as Texas, are building more sophisticated data mining programs that will predict taxpayer behavior, much as credit-card companies try to estimate how much consumers will spend over the course of a year. "The capability is there to figure out which taxpayers have the highest probability of becoming noncompliant," says Steven E. Taylor, director of the revenue and compliance team of the data warehousing firm Teradata, a unit of NCR (NCR). Iowa, Massachusetts, and Virginia are also in the data mining vanguard.

MANY DATABASES. Typically, each state revenue agency will work with one data management company and its subcontractors, drawing from a list that includes Teradata, Revenue Solutions of Pembroke, Mass., and CGI Group of Montreal. The data miners can construct powerful programs that assign each taxpayer the equivalent of a credit score, flagging those who should be targeted for an audit. They can project who is likely to file on time, who won't pay until they get a visit from a collection agent, and even who is likely to declare bankruptcy before paying their taxes.

(Also available here).

Doesn't sound all that unreasonable -- if everyone pays their "fair share", honest people will not have to make up the difference by paying more. But is it OK for local, state, and federal governments to scrutinize every detail of our lives and our lifestyles in order to catch "cheaters", just because, with the latest current and future technologies, they can?

Or how about this:

Wi-Fi plan stirs Big Brother concerns
Privacy advocates are raising concerns about Google Inc.'s plans to cover San Francisco with free wireless Internet access, calling the company's proposal to track users' locations a potential gold mine of information for law enforcement and private litigators.

The Mountain View search engine intends to use the geographic data to match users with advertising so that they would see marketing messages from neighborhood businesses such as pizza parlors, cafes and book stores.

Google plans to use technology that would allow it to track users' whereabouts within a few hundred feet. The company said in its bid that it would retain the data for up to 180 days before deleting it, as part of an effort to "maintain the Google Wi-Fi network and deliver the best possible service."

Privacy advocates fear the information could by used by government officials to place users under surveillance and are more generally concerned that this new power raises the specter of "Big Brother" run amok.

"The greatest concern is that once you have that treasure trove of information, will people start to come looking for it?" said Kurt Opsahl, staff attorney for the Electronic Frontier Foundation, a privacy watchdog group.

Is this relatively harmless, if in return for being tracked we get free WiFi access and the "benefit" of (possibly) relevant advertising from businesses just around the corner from wherever we happen to be? Should we just not worry that big companies like Google and their advertisers -- to say nothing about governments at all levels who will be looking over the businesses' shoulders -- can know, within a few hundred feet, where we are at all times our computers or cell phones are turned on? Is it just a paranoid fantasy that some day governments will have real-time access to such Internet traffic, so that we find ourselves arrested at Fisherman's Wharf because some government snoop is on the lookout for a "terrorist" who just happens to have the same name as ours?

What makes such things so scary is the liklihood that today, right now, or if not now, very soon, the government can and does watch every last bit of traffic on the Internet, with the cheerful cooperation of telephone and cellular companies. At least, that's the implication of what I'm reading, like this:

Whistle-Blower Outs NSA Spy Room
According to a statement released by Klein's attorney, an NSA agent showed up at the San Francisco switching center in 2002 to interview a management-level technician for a special job. In January 2003, Klein observed a new room being built adjacent to the room housing AT&T's #4ESS switching equipment, which is responsible for routing long distance and international calls.

"I learned that the person whom the NSA interviewed for the secret job was the person working to install equipment in this room," Klein wrote. "The regular technician work force was not allowed in the room."

Klein's job eventually included connecting internet circuits to a splitting cabinet that led to the secret room. During the course of that work, he learned from a co-worker that similar cabinets were being installed in other cities, including Seattle, San Jose, Los Angeles and San Diego.
More on this story: here, here, here.

Of course, since the New York Times last December broke the story of illegal NSA wiretapping of U. S. citizens, vague information about this has been widely reported. But the latest revelations are rather alarming. There's a lot more to this than ordinary, old-fashioned wiretaps of a few suspected "terrorists". It's looking more and more as though what this is about is the systematic surveillance of (potentially) every last telephone and Internet communication that the NSA can get its hands on.

And that is just about everything that flows over communications lines in U. S. territory. The technology to do this exists and is very real, as this long and technical diary at Daily Kos explains: All About NSA's and AT&T's Big Brother Machine, the Narus 6400.

I won't quote from there, since it's long and geeky. But if you have any doubts about the technical ability of the government to perform such surveillance, maybe you should read it. The bottom line is that the government can monitor, in real time, every phone call, every email, every file download, every Web page access, and every electronic financial transaction that involves anybody located in the U. S.

And that's only the beginning. The Internet is no longer just for computers. All sorts of everyday things are, or before long will be, connecting to the Internet. Many new cars come equipped with "black boxes", like those on aircraft, to record speed, braking action, stops and starts, etc. (See here and here.) They could record location as well, if a GPS device (or similar technology based on the cellular phone system) is on board. With this, and with wireless Internet communications capability (based on WiFi and eventually WiMax), the NSA could monitor this same information -- in real time.

Are you driving "suspiciously" in the neighborhood of some critical infrastructure (even if you're not aware of it)? Have you ever, perhaps, visited a part of town that could get you into blackmail problems? Better watch out, because Big Brother will know.

It would be reassuring to think that such concerns were merely paranoid fantasies. But how much should we, as individuals and as citizens, stake our future on a belief that the intentions of our government are entirely benign? Perhaps we should at least understand what they're capable of. Of course, they will never disclose their full capabilities, let alone what capabilities they're actually using. That stuff's highly Top Secret. It wouldn't do to allow the "terrorists" to find out, now, would it?

But of course, none of us are terrorists, right? And we never have cheated on taxes, and never will. So what do we have to be afraid of?

Well, simple mistakes for one thing. Many people, including Senators and Congressmen, have already not been allowed to board an airplane or even been detained at an airport, simply because some name that happened to be the same as theirs was on a list of suspected "terrorists".

But it's worse than that. Today, everybody who has a bank account, a credit card, or a commercial loan has a credit rating, whether they realize it or not. In the near future, if not already, everybody could also have a loyalty rating. Government computers at the NSA, and elsewhere, will be computing this score on a profusion of data collected from existing business and government databases and all the data flowing over the Internet itself. That's what "data mining" is all about. There are plenty of excuses they can come up with for doing this -- watching for "terrorists", tracking down fugitives and deadbeat dads and people with unpaid traffic tickets, screening for potential tax cheats, seeking out money launderers and drug dealers and pedofiles. For just about every law on the books, there's a good excuse for snooping to find anyone who's breaking it.

The point is, governments will be doing this data mining. And the "profiles" compiled about you by all these government computers will be passed around and shared with other computers as long as you're alive. In particular, this "loyalty" rating. Even if you're not a "terrorist" or "subversive'.

Who knows what might go into the ratings? If the government knows you like Christian music, maybe you'll get points added to your rating. But if you prefer music genres that are more in favor with other groups (Islamic music?), you'll lose points on your rating. No discrimination intended, mind you. It's just that, well, church-going Christians who give more than $1000 a year to the church are known statistically to need less thorough scrutiny than your average potential "terrorist". Same with your political preferences. If you're a known supporter of the party in power, your rating goes up. If you support the opposition party, it goes down. Again, nothing personal, you know. The statistics just say that contributors to the party in power are more trustworthy than those who hang out with people associated with the other party.

The govenment has the ability today to compute such "loyalty" ratings. Can you say you're confident that the government would never, ever, use the available technology to do it? (If so -- and the government will probably know this -- your rating will certainly be higher than if not.)

And here's one more thing. Even if we personally are as pure and loyal as the driven snow, what's to stop a government overly infatuated with holding onto power from snooping into the lives and opinions and finances of any politician or office holder belonging to an opposition party at any level of government? Could be helpful to know about any and all skeletons in their closets, no?

Just in case I haven't made you sufficiently concerned, here are a few more news items to think about:

Tax tech pays dividends
From data mining to predictive modeling techniques, information technology is an increasingly important tool for state governments that want to improve their tax handling performance by speeding tax processing and boosting tax collections. Such technologies are components of a financial enterprise in which one tax application links to another to produce an overview of individual portfolios.
Pay attention to the part about applications linking together. These same applications can feed into another set that generates a "loyalty" rating. Want to bet it will never happen?

IBM Announces Advanced Analytics to Help Revenue Agencies Optimize Tax Auditing Process
IBM today announced a Tax Audit and Compliance Solution that uses advanced analytics to help revenue agencies zero in on questionable tax returns. The solution is currently being used by U.S. state revenue agencies as well as international government agencies.

By providing a more scientific, data-driven approach to tax audit case selection, the Tax Audit and Compliance Solution goes well beyond existing methods of tracking tax compliance, which range from manually matching internal data with lists of taxpayers to using data warehouse and query tools. By identifying possible compliance problems at the time a tax return is filed, the solution, which is capable of data mining thousands of tax returns in seconds, can potentially help save years of tracking, investigation and collection costs.

Developed by IBM scientists, the solution uses algorithmic data mining and predictive modeling to compare individual taxpayer behaviors to those of similar taxpayers. The resulting analysis helps agencies to detect new tax evasion methods and provides auditors with lists of potentially fraudulent tax returns.
So, this kind of sophisticated data mining software is available for purchase off the shelf. Is there any doubt it will also be used by credit rating "services", marketing organizations, ... and political parties? In fact, such tools are already used to target voters in fund raising and GOTV operations. The party in power definitely knows who its friends are, and as for everyone else... points can be taken off their loyalty rating. The government need not fear disclosure of how it computes the loyalty rating -- that's all highly classified, of course.

Policing Trade to Nab Terrorists
In the first formal effort to combat these techniques, the U.S. in January teamed up with the governments of Argentina, Brazil and Paraguay to create "Trade Transparency Units" that allow the countries to share detailed information about each others' import and export transactions. Armed with a U.S.-designed data-mining computer program, investigators sift through the information looking for anomalies in commerce that could indicate terrorist financing or other criminal activity.
The same software, of course, can be used internally to the U. S. to scrutinize any financial transaction at all -- buying a house or car, trading stocks or options, contributing to political organizations... Given that such transactions do now, or will, take place over the Internet, cooperation from banks or any of the parties involved isn't even needed.

OK, enough of this for now. There are plenty of other things to fret about, some of them problems today, some of them for the not-too-distant future. Such as smart-card driver's licenses, passports, and ID cards that can get on the Internet themselves and rat on the people who carry them. Or future personal computers that come from the factory with government-mandated spyware embedded in the hardware. (Media companies and organizations like the RIAA are already clamoring for this sort of thing in order to "protect their intellectual property".) Together with Internet access, the NSA can then read any of your files, watch your every keystroke, and learn all your passwords and encryption keys.

All without any search warrant or court overview required, of course!

Worried yet?

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