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Recent demands on the military have raised concerns about the impact of extended deployments on military marriages. To evaluate this impact, the authors draw on marital status data in service personnel records to estimate trends in marriage and marital dissolution between 1996 and 2005 and the specific effects of time deployed to Afghanistan and Iraq on subsequent risk of ending a marriage. The results generally run counter to expectations. Although rates of marital dissolution have increased since 2001 for most services and components, they had declined in the five years prior to 2001. As a result, marital dissolution rates across the services and components are currently similar to those observed in 1996, when the demands on the military were measurably lower. In most cases, service members who were deployed had a lower risk of subsequently ending their marriages than service members who did not deploy or deployed fewer days. more...

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The #1 getting-into-college guide! more...

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How much data regarding U.S. anti- and counterterrorism systems, countermeasures, and defenses is publicly available and how easily could it be found by individuals seeking to harm U.S. domestic interests? The authors developed a framework to guide assessments of the availability of such information for planning attacks on the U.S. air, rail, and sea transportation infrastructure, and applied the framework in an information-gathering exercise that used several attack scenarios. Overall, the framework was useful for assessing what kind of information would be easy or hard for potential attackers to find. For each of the attack scenarios, a team of “attackers” was unable to locate some of the information that a terrorist planner would need to gauge the likely success of a potential attack. The authors recommend that procedures for securing sensitive information be evaluated regularly and that information that can be obtained from easily accessible, off-site public information sources be included in vulnerability assessments. more...

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Boost Your grades with this illustrated quick-study guide. You will use it from college to graduate school and beyond. FREE Geometry Background and Triangles chapters in the trial version. Clear and concise explanations. Difficult concepts are explained in simple terms. Illustrated with graphs and diagrams. Table of Contents. Geometry Background. Euclidean Geometry. Euclidean Space. Line. Line Segment. Incidence of planes and lines. Incidence Structure. Euclidean Distance. One-dimensional distance. Two-dimensional distance. Three-dimensional distance. Postulate. The Plane Areas of Mathematics. Translation. Translational Symmetry. Similarity. Triangles. Triangle. Types of triangles. Points, lines and circles associated with a triangle. Computing the area of a triangle. Using vectors. Using trigonometry. Using coordinates. Using Heron''s formula. Ceva''s Theorem. Heron''s Formula. Equilateral Triangle. Right Angle. Pythagorean Theorem. Pythagorean Triple. Heronian Triangle. Triangle Inequality. Pedoe''s Inequality. Similar triangles. Parallel Lines. Congruence. Parallel Postulate. Polygons. Convex polygon. Internal Angle. Diagonal. Perimeter. Quadrilateral. Isosceles Trapezoid. Parallelogram. Kite. Rhombus, Rhomboid. Rectangle. Square. Cyclic Quadrilateral, Brahmagupta''s formula. Tangential Quadrilateral. Star Polygon. Circles. Analytic results. Properties. Calculating the parameters. Area of a Disk. Circular Sector. Circular Segment. Circumference. Nine-point Circle. Transformational Geometry. Scaling. Rotation,. Euler''s Formula,. Rotation Matrix,. Quaternions and Spatial Rotation. Reflection. Coordinate Rotations and Reflections. Linear Map. Solid Geometry. Dihedral angle and Solid angle. The Cube. Cuboid. Hypercube Graph. Parallelepiped. Prisms. The Tetrahedron and Pyramid. Octahedron, Dodecahedron, Icosahedron. Cones and Cylinders. The Sphere and Spheroid,. Quadrics:. Ellipsoid. Paraboloid. Hyperboloid. more...

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Smarten Up—It's Time to Choose the Right College Think that your life's growth, success, and happiness depend on which college you attend? The higher-profile school, the better, right? Wrong! Neither is true. Written by, yes, a Harvard grad, Harvard Schmarvard rebuts the perception that image is everything when it comes to college and emphasizes this simple fact: What you will be measured by in life is your talent and energy, not your college's name. more...

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