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The real challenge, then, may be to explain why we do not live in a weakless universe.
Looking for Life in the Multiverse: Scientific American
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The second reason to suspect the existence of the multiverse is that one quantity still seems to be finely tuned to an extraordinary degree: the cosmological constant, which represents the amount of energy embodied in empty space. Quantum physics predicts that even otherwise empty space must contain energy. Einstein’s general theory of relativity requires that all forms of energy exert gravity. If this energy is positive, it causes spacetime to expand at an exponentially accelerating rate. If it is negative, the universe would recollapse in a “big crunch.” Quantum theory seems to imply that the cosmological constant should be so large—in the positive or negative direction—that space would expand too quickly for structures such as galaxies to have a chance to form or else that the universe would exist for a fraction of a second before recollapsing.
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Thus, the cosmological constant seems to be fine-tuned to an exceptional degree.
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Looking for Life in the Multiverse: Scientific American
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We do not think that this is necessarily the case, for two reasons. The first comes from observation, combined with theory. Astronomical data strongly support the hypothesis that our universe started out as a tiny patch of spacetime, perhaps as small as a billionth the size of a proton, which then went through a phase of rapid, exponential growth, called inflation. Cosmology still lacks a definitive theoretical model for inflation, but theory suggests that different patches could inflate at different rates and that each patch could form a “pocket” that can become a universe in its own right, characterized by its own values for the constants of nature
Looking for Life in the Multiverse: Scientific American
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In our universe, supernova explosions disperse the newly synthesized elements into space, and synthesize more of the elements themselves. Supernovae can be of several types: in the weakless universe, the supernova explosions caused by collapsing ultramassive stars would fail, because it is the emission of neutrinos, produced via the weak-force interactions, that transmits energy out of a star’s core so as to sustain the shock wave that is causing the explosion. But a different type of supernova—the thermonuclear explosion of a star triggered by accretion, rather than by gravitational collapse—would still take place. Thus, elements could be dispersed into interstellar space, where they could seed new stars and planets.
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Chemistry, on the other hand, would be very similar to that of our world. One difference would be that the periodic table would stop at iron, except for extremely small traces of other elements. But this limitation should not prevent life-forms similar to the ones we know from evolving. Thus, even a universe with just three fundamental forces could be congenial to life.
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Looking for Life in the Multiverse: Scientific American
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Without the strong nuclear force to bind quarks into protons and neutrons and those into atomic nuclei, matter as we know it would not exist. Without the electromagnetic force, there would be no light; there would also be no atoms and no chemical bonds. Without gravity, there would be no force to coalesce matter into galaxies, stars and planets.
The fourth force, the weak nuclear force, has a subtler presence in our everyday life but still has played a major role in the history of our universe. Among other things, the weak force enables the reactions that turn neutrons into protons, and vice versa.
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Without the weak nuclear force, then, it seems unlikely that a universe could contain anything resembling complex chemistry, let alone life. Yet in 2006 Perez’s team discovered a set of physical laws that relied on only the other three forces of nature and still led to a congenial universe.
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Looking for Life in the Multiverse: Scientific American
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Several physicists have argued that a slight change to one of the laws of physics would cause some disaster that would disrupt the normal evolution of the universe and make our existence impossible. For example, if the strong nuclear force that binds together atomic nuclei had been slightly stronger or weaker, stars would have forged very little of the carbon and other elements that seem necessary to form planets, let alone life. If the proton were just 0.2 percent heavier than it is, all primordial hydrogen would have decayed almost immediately into neutrons, and no atoms would have formed. The list goes on.
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Our recent studies, however, suggest that some of these other universes—assuming they exist—may not be so inhospitable after all. Remarkably, we have found examples of alternative values of the fundamental constants, and thus of alternative sets of physical laws, that might still lead to very interesting worlds and perhaps to life. The basic idea is to change one aspect of the laws of nature and then make compensatory changes to other aspects.
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AD Logons and Network Traffic | NetworkWorld.com Community
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The traffic that you’re likely to see during a domain logon spans several protocols. Early in the process you are likely to see some Kerberos traffic (protocol KRB5 for example) which has to do with authentication and the issuance of “tickets” that grant access to the network. A bit later you may see some SMB traffic (Server Message Block) that sets up network drive mappings for the client. Around this time you may also see some DNS traffic designed to retrieve information about Active Directory site configuration.
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Some LDAP traffic will also show up, for example, so that the client can learn about the various “naming contexts” it should use when communicating with AD; you’ll need to do a lot of drilling down to find the “meat” of some of these LDAP requests and responses.
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Wireshark Errors - Or Are They? | NetworkWorld.com Community
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Because Wireshark captures outbound packets before they actually get to the hardware, it doesn’t see that the NIC is applying the correct TCP checksums, and so it flags an error.
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A little research with a good book on TCP could raise a concern that you’re experiencing lost packets, but that may not be what’s happening. This message lets the sender know that the receiver got a packet out of order. But that can happen sometimes and isn’t necessarily indicative of trouble. If you get a lot of packets out of order at one time, say three or four in a row, then it could be that there is a problem, in which case you can move your capture point further upstream to see if the DUP ACK messages disappear at some point. But seeing this message occasionally is normally not a cause for concern.
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Book Review: Last Exit to Utopia - WSJ.com
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It concerns itself primarily with the failure of much of the French left to come to grips with the collapse of communism and the exposure of its innumerable crimes.
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What's more, the book's themes continue to resonate today, when murderous ideologies still compete for legitimacy and "enlightened" understanding by the Western intelligentsia.
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A Speculative Post on the Idea of Algorithmic Authority « Clay Shirky
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and I used my remarks to observe that one of the things up for grabs in the current news environment is the nature of authority.
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I called this tendency algorithmic authority.
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Dishwashers, and How Google Eats Its Own Tail
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This is, of course, merely a personal example of the drive-by damage done by keyword-driven content -- material created to be consumed like info-krill by Google's algorithms. Find some popular keywords that lead to traffic and transactions, wrap some anodyne and regularly-changing content around the keywords so Google doesn't kick you out of search results, and watch the dollars roll in as Google steers you life-support systems connected to wallets, i.e, idiot humans.
Google has become a snake that too readily consumes its own keyword tail. Identify some words that show up in profitable searches -- from appliances, to mesothelioma suits, to kayak lessons -- churn out content cheaply and regularly, and you're done. On the web, no-one knows you're a content-grinder.
The result, however, is awful. Pages and pages of Google results that are just, for practical purposes, advertisements in the loose guise of articles, original or re-purposed. -
Google has become a snake that too readily consumes its own keyword tail. Identify some words that show up in profitable searches -- from appliances, to mesothelioma suits, to kayak lessons -- churn out content cheaply and regularly, and you're done. On the web, no-one knows you're a content-grinder.
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How Google Can Combat Content Farms
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Perhaps we should first answer the question: why should Google be worried about the quality issue? After all, it has a virtual monopoly on the search market. The obvious and PR answer is that Google wants to provide the best search results possible for its users. But there is another big reason why Google needs to do something. So-called "quality" content providers are already well advanced in routing around Google, or at least making them less relevant.
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the company already makes the "vast majority of its revenues" from subscription-based business models targeted to "vertical and niche markets." Reuters also provides services as well as just content. Bloomberg is another leading media company finding success with this strategy.
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The Question of Quantum Chaos § SEEDMAGAZINE.COM
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Chaotic movement is unstable and unpredictable, but completely deterministic, meaning that it’s controlled by its starting conditions.
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Chaos has been observed at nearly every level of the natural world, from the movement of the planets to the patterns of wind to the beating of the human heart. In fact, almost everything in nature is chaotic.
But at the level of atoms, our definition of chaos has run into a problem.
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Why The Magazine Industry Wants Its Own App Store. It’s All About The Data.
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The real reason they want their own store is the customer data. Magazine companies may look like paper companies, with a little art direction thrown in. But at their core, magazine companies are database companies. The way they make money is by knowing who their readers are and marketing to them by where they live and who they are. For nearly every subscriber, they have a credit card number. And they have whole departments which do nothing but massage the data to figure out who to target for advertising purposes and where the profits are. I’ve seen this machine in action. The database people hold the secret levers of power inside magazine companies.
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If they cede their digital magazines to Apple, then they lose those credit card numbers and all of that customer data. This joint venture is all about keeping that direct, paying relationship with consumers. It is about controlling the data.
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U.S. Military Joins CIA’s Drone War in Pakistan | Danger Room | Wired.com
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On that glowing screen is a digital map of Afghanistan, showing the position of every U.S. Air Force drone, every fighter jet, every bomber, and every tanker aircraft with a teal dot.
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The military supplies the aircraft. It monitors the flights in and out of Pakistan. And, on occasion, Air Force pilots remotely fly their own drone missions over Pakistan. On that digital map are the far end of the warehouse, there’s a note reminding troops exactly how much notice they must give before U.S. military planes enter Pakistani airspace.
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Op-Ed Columnist - Obama’s Logic Is No Match for Afghanistan - NYTimes.com
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If the enemy in Afghanistan today threatens the American homeland as the Viet Cong never did, we should be all in, according to Obama’s logic. So why aren’t we? The answer is not merely that Afghans don’t want us as occupiers. It’s that such a mission would require a commensurate national sacrifice. One big difference between the war in Vietnam and the war in Afghanistan that the president conspicuously left unmentioned on Tuesday is the draft.
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As L.B.J. learned the hard way, we can’t have both guns and the butter of big domestic projects, from health care to desperately needed jobs programs. We have to make choices. Obama paid lip service to that point, but the only sacrifice he cited in the entire speech was addressed to his audience at West Point, not the general public — the burden borne by the military and military families.
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Verizon: Data Breaches Getting More Sophisticated | Threat Level | Wired.com
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Methods of stealing data are becoming increasingly sophisticated, but attackers are still gaining initial access to networks through known, preventable vulnerabilities, according to a report released by Verizon Business on Wednesday.
“The attackers still usually get in the network through some relatively mundane attacks,” said Wade Baker, research and intelligence principal for Verizon Business’s RISK Team, in an interview. ”But once they’re in, they’re getting more and more adept at getting the data they want and getting it effectively and silently. And we seem to be on a plateau in terms of our ability to detect [them].”
For example, while companies have been expanding their use of encryption to protect bank card data in transit and in storage, hackers countered with RAM scrapers that grab data during the few seconds it’s unencrypted and transactions are being authorized.
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Methods of stealing data are becoming increasingly sophisticated, but attackers are still gaining initial access to networks through known, preventable vulnerabilities, according to a report released by Verizon Business on Wednesday.
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Splitting Time from Space—New Quantum Theory Topples Einstein's Spacetime: Scientific American
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Physicists have struggled to marry quantum mechanics with gravity for decades. In contrast, the other forces of nature have obediently fallen into line.
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More specifically, the problem is the way that time is tied up with space in Einstein’s theory of gravity: general relativity. Einstein famously overturned the Newtonian notion that time is absolute—steadily ticking away in the background. Instead he argued that time is another dimension, woven together with space to form a malleable fabric that is distorted by matter. The snag is that in quantum mechanics, time retains its Newtonian aloofness, providing the stage against which matter dances but never being affected by its presence. These two conceptions of time don’t gel.
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Afghan Militias Battle Taliban With Aid of U.S. - NYTimes.com
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The emergence of the militias, which took some leaders in Kabul by surprise, has so encouraged the American and Afghan officials that they are planning to spur the growth of similar armed groups across the Taliban heartland in the southern and eastern parts of the country.
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By harnessing the militias, American and Afghan officials hope to rapidly increase the number of Afghans fighting the Taliban. That could supplement the American and Afghan forces already here, and whatever number of American troops President Obama might decide to send. The militias could also help fill the gap while the Afghan Army and police forces train and grow — a project that could take years to bear fruit.
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Obama's Afghanistan strategy should team our soldiers with their militias. - By Fred Kaplan - Slate Magazine
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A tribe-centered strategy may appeal to Obama in several ways. First, it keeps the Afghan people, not American occupiers, at the center of the operation. The U.S. soldiers live alongside the tribes, build trust, train them, supply them, gather intelligence from them, and fight with them. We are supporting players, not the lead.
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Second, these teams of U.S. soldiers are small. As Gant puts it, the approach requires a lot of time—many months to gain a foothold, years to make the bonds stick—but not a lot of manpower.
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