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Perpetual Futility A short history of the search for perpetual motion. by Donald E. Simanek Popular histories too often present perpetual motion machines as "freaks and curiosities" of engineering without telling us just how they were understood at the time. They also fail to inform us that even in the earliest history of science and engineering, many persons were able to see the futility and folly of attempts to achieve perpetual motion. Sometimes a particular device comes to us with a label, such as "Bishop Wilkins' magnetic perpetual motion machine."
Cryptography Visualization Software Downloads
New NSF Project This page will be updated soon to include more information and software updates (Updated April 22, 2014 - New Version of VIGvisual) This page has our most recent work in developing a visualization system for an introductory cryptography course.
Realtime Visualization Methods in the Demoscene
Realtime Visualization Methods in the Demoscene Boris Burger, Ondrej Paulovic, Milos Hasan burger@nextra.sk, twinsen@mayhem.sk, milos.hasan@inmail.sk Department of Computer Graphics and Image Processing Faculty of Mathematics, Physics and Informatics Comenius University Bratislava / Slovakia Abstract This paper introduces a concept of the ''demoscene'' phenomenon arising mainly among the lines of students who share interest in computer graphics and multimedia creations.
2.cs.cmu
This book contains 209 tales collected by the brothers Grimm. The exact print source is unknown. The etext appears to be based on the translation by Margaret Hunt called Grimm's Household Tales, but it is not identical to her edition. (Some of the translations are slightly different, the arrangement also differs, and the Grimm's scholarly notes are not included.) The etext received by the Universal Library did not include story titles. They have been restored in this edition, based on Hunt's titles.
A new formula for avoiding supermarket queues
Supermarket queues are dreaded by many. In the TV series ‘Supernatural’, people standing in an endless queue are used as an example of what hell really looks like. (Photo: Colourbox) In researcher Kebin Zeng’s office hangs a big whiteboard filled with mathematical formulas and functions.
techrepublic
There's a lot to know about encryption, and the ins and outs can get confusing. Here's a rundown of what professionals need to know about this fundamental of modern computing. This device is unable to play the requested video. Quantum encryption is about to change everythingQuantum computing could crack contemporary encryption, but might also create nearly-unbreakable new privacy protocols. Data: It's everywhere, and it has to be protected.
An Illustrated Guide to Cryptographic Hashes
With the recent news of weaknesses in some common security algorithms (MD4, MD5, SHA-0), many are wondering exactly what these things are: They form the underpinning of much of our electronic infrastructure, and in this Guide we'll try to give an overview of what they are and how to understand them in the context of the recent developments. But note: though we're fairly strong on security issues, we are not crypto experts. We've done our best to assemble (digest?) the best available information into this Guide, but we welcome being pointed to the errors of our ways.
Adam Smith, Wealth of Nations, Contents
Introduction Chapter 1. Of the Division of Stock Chapter 2. Of Money considered as a particular branch of the general Society, or of the Expense of maintaining the National Capital
An App That Encrypts, Shreds, Hashes and Salts
The Wickr app. When it comes to mobile apps and social networks, the devil, increasingly, is in the default settings. Companies have little, if any, incentive to let users opt out of services that siphon their personal data back to the advertisers who pay their bills. Nor do companies have any legal mandate to secure users’ personal information with hacker-proof encryption. The responsibility is very much on the user to opt out of services and read through the fine print in privacy policies to understand how their personal data is used, secured and sold. A group of computer security experts want to turn that model on its head with Wickr, a new mobile app that they hope will set a new standard for how personal data is disseminated.
American Indian Stories.
American Indian Stories by Zitkala-Sa [aka Gertrude Simmons Bonnin] (1876-1938). Washington: Hayworth Publishing House, 1921. [Page] [Frontispiece]
Ham sandwich theorem
Not to be confused with the "squeeze theorem" (sometimes called the "sandwich theorem"). Naming[edit] A ham sandwich History[edit] According to Beyer & Zardecki (2004), the earliest known paper about the ham sandwich theorem, specifically the n = 3 case of bisecting three solids with a plane, is by Steinhaus (1938).
Federal judge says you can break DRM if you're not doing so to infringe copyright
Here's some remarkable news: a judge in a New Orleans-based 5th Circuit Appeals Court has ruled that the Digital Millennium Copyright Act's ban on breaking DRM only applies if you break DRM in order to violate copyright law. This is a complete reversal of earlier rulings across the country (and completely opposite to the approach that the US Trade Representative has demanded from America's trading partners). In the traditional view, DRM is absolutely protected, so that no one is allowed to break it except the DRM maker.
Wisdom and Humor: The Suslick Research Group
The Three Laws of Thermodynamics (mathematically precise version) You can't win. You can break even only on a very cold day. It never gets that cold.
