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Medium 9781934009239

Big Idea Five: Learn and Adjust Based on Data

Slice ePub September 11, 2014
<p>My job causes me to spend a lot of time on airplanes. Thankfully, over the years most of my flights have been fairly routine and uneventful. However, there is one particular flight that I will never forget. I was flying from Atlanta to Albuquerque. It was a relatively smooth flight, and everything had gone along pretty much as usual. Toward the end of the flight, the pilot announced that we had been cleared for landing and should be on the ground in just a few minutes. He asked the flight attendants to prepare the cabin for landing. As we approached the ground, I looked out the window and noticed the sky was getting unusually dark. I also noticed what appeared to be a wall of rain in the distance quickly moving in the direction of our plane. The landing gear had already dropped and we were almost touching the ground when, without warning, the pilot suddenly pulled up the nose of the plane, causing it to shoot straight back up into the air, the force of gravity throwing all the passengers back in our seats.</p><a class="default-logo-link" href="/ebooks/243141-five-big-ideas-leading-total-instructional-alignment">See more</a>

Medium 9781937538538

9 Is Photography a Life Experienced Second-Hand?

Slice ePub November 04, 2014
<p>When I was younger, I regarded photography with ambivalence. I originally wanted to become a painter and paint like the American realist, Edward Hopper. The first paintings that I created during my years as an art student were not bad, but I soon realized that I was too impatient for oil painting. Photography became my medium of choice.</p><p>When I was on the island of Gomera in the Canary Islands, a young woman asked me if photography was a type of substitute life. I was impressed by this profound question and have thought about it often. Can the act of taking a photograph truly be as immediate an experience as our actual life? Or is the act of viewing those moments through the camera’s viewfinder enough to remove us from the flow of the actual experience?</p><p>At that time, I was reading the works of Alan Watts, who characterized the Tao life of the Western man as follows: The Western man lives as though he is walking toward a river. Rather than experience joy in the flow of the river, he takes many canisters with him to the river, fills them with river water, and carries them home; only to wonder when he gets there, why the water no longer flows.</p><a class="default-logo-link" href="/ebooks/777554-photography-as-meditation-tap-into-the-source-of-your-creativity">See more</a>

Medium 9780596006709

Types of Firewall and DMZ Architectures

Slice PDF May 27, 2014
<p>Stateful packet filtering</p><p>At its simplest, the tracking of TCP sessions: using packets’ TCP header information to determine which packets belong to which transactions, and thus filtering more effectively. At its most sophisticated, stateful packet filtering refers to the tracking of not only TCP headers, but also some amount of applicationlayer information (e.g., end-user commands) for each session being inspected.</p><p>Linux’s iptables include modules that can statefully track most kinds of TCP transactions and even some UDP transactions.</p><p>TCP/IP stack attack</p><p>A network attack that exploits vulnerabilities in its target’s TCP/IP stack (kernelcode or drivers). These are, by definition, OS specific: Windows systems, for example, tend to be vulnerable to different stack attacks than Linux systems.</p><p>With the exceptions of “stealth scanning” and of TCP-sequence-number attacks</p><p>(used in IP spoofing), stack attacks are becoming less common.</p><p>That’s a lot of jargon, but it’s useful jargon (useful enough, in fact, to make sense of the majority of firewall vendors’ propaganda!). Now we’re ready to dig into DMZ architecture.</p><a class="default-logo-link" href="/ebooks/363795-linux-server-security">See more</a>

Medium 9780596514129

4. Documents, Programs, & Spaces

Slice ePub May 28, 2014
<p>The beauty of life in the Era of Switchers is that most of the big-boy programs are available in nearly identical versions for both the Mac and Windows. Word, Excel, and PowerPoint; Photoshop, Illustrator, and InDesign; FileMaker Pro; Dreamweaver; and many other programs are available for both Mac and Windows. Sometimes you have to buy the Mac version separately; sometimes it's on the same CD.</p><p>The best part: The documents you create with the Mac versions are generally <em>identical in format</em> to the ones created in Windows. A Microsoft Word document, for example, requires no conversion when transferred from a Mac to a PC or vice-versa. It is what it isa .doc or .docx file.</p><p>UP TO SPEED: Carbon, Cocoa, and Classic (R.I.P)</p><p>There are two chief kinds of Mac OS X-compatible programs, known by the geeks as <em>Carbon</em> and <em>Cocoa</em> programs. These terms refer to the programming tools that were used to create them, which also have a small effect on how well they run in Mac OS X. Two Kinds of Programs: Cocoa and Carbon covers them in more detail, but the point is that this chapter describes how Carbon and Cocoa programs workthese are true Mac OS X programs.</p><a class="default-logo-link" href="/ebooks/362940-switching-to-the-mac-the-missing-manual-leopard-edition-leopard-edition">See more</a>

Medium 9781591202509

15. Immunity

Slice ePub January 09, 2014
<p>An elaborate, finely tuned defense system destroys and counters the effects of viruses, bacteria, yeasts, and foreign substances that operate within the tissues and cells in the bloodstream. Called the immune system, this system distinguishes <em>self</em> from <em>nonself;</em> that is, substances that are not part of the body, according to Robert A. Ronzio, PhD.<sup>1</sup></p><p>“When the immune system is healthy, it destroys foreign elements without causing symptoms, but an imbalanced immune system can set the stage for disease,” he said. “Foreign substances and microorganisms may not be recognized or destroyed, resulting in chronic infection. An imbalanced immune system can attack the body’s own tissues, creating autoimmune diseases, or it can over-respond to common substances, thereby creating allergies.”</p><p>Cellular immunity includes macrophages, cells that engulf foreign invaders, Ronzio said. Macrophages live in the tissues like the spleen, the liver (Kupffer cells), the lymph nodes (wandering macrophages), the spinal cord, the brain (microglia), and connective tissue.</p><a class="default-logo-link" href="/ebooks/613909-sunshine-and-vitamin-d">See more</a>

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