 SpaceTime  Chris and Stephen DeSalvo
SpaceTime develops mathematics software for personal digital assistants (PDAs) and other mobile devices such as Pocket PCs, Palm Pilots, and smartphones. Play JavaScript and Flash games in the arcade: ArithmeTick, Math Scramble, Math Mountain, Snake,
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 Space Time Travel  Ute Kraus and Corvin Zahn (Theoretische Astrophysik Tübingen)
Black holes and travel at nearly the speed of light: Visualization of the theory of relativity. Online papers, images, movies and paper models. English version of the German site.
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 Spanky Fractal Database  Noel Giffin
A collection of fractals and fractalrelated material for free distribution on the net. Most of the software has been gathered from various ftp sites on the Internet and is freeware or shareware. Contents: An index of Fractal material; General information;
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 Spark! Learning Lab  Putnam Museum
This permanent exhibit at Davenport's science museum features a gravity wall, Bernoulli blower, SMARTboard technologies, and other handson exhibits for exploring the science, technology, engineering and mathematics (STEM) of electrical circuits, construction
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 SPA Software
A U.K.based software company, makers of educational software in several subjects including mathematics.
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 Spatial Geometry  Nima Bigdely; NIMA Software Group
3D display software, designed to help students visualize spatial geometry. Shareware for Win95/98/ME/2000/NT/XP. Download available online.
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 Spatial Intelligence and Learning Center
The Spatial Intelligence and Learning Center (SILC) researches spatial learning and develops educational programs and technologies. Every month, the SILC showcase highlights research by different members, who include cognitive scientists, psychologists,
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 Speakeasy  Speakeasy Computing Corporation
A userfriendly computational software package that enables novice and
experienced users to solve realworld problems. An intuitive computational language provides a natural way to communicate with your computer.
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 Speaking of Mathematics (Computing Science)  Brian Hayes, American Scientist
An article about AsTeR (Audio System For Technical Readings), a computing system for rendering technical documents in audio.
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 Speaking to Write: Speech Recognition for Secondary Students with Disabilities  Education Development Center, Inc. (EDC)
A project from EDC and the Communication Enhancement Center at Children's Hospital, Boston and funded by the DOE to explore using speech recognition software/voice recognition. Researchers will develop, pilot, publish, and market integrated adaptations
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 Special Interest Groups: American Educational Research Association (AERA)  College of Education, Arizona State University
Index and complete list of AERA SIGs, which provide a forum within AERA for the involvement of individuals drawn together by a common interest in a field of study, teaching, or research when the existing divisional structure may not directly facilitate
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 Special Relativity  MacTutor Math History Archives
Linked essay describing the history of special relativity from Newton's laws through Lorentz and Einstein, with 12 references (books/articles).
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 Speed Math Trainer  Jimmy Ruska
Flashbased, very tiny file size, speed math program including a Google video tutorial. Watching the video tutorial is highly recommended as the program can be tricky to use. Free for redistribution and potentially useful for anyone wishing to increase
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 Sphere Formulas (Ask Dr. Math FAQ)  Math Forum
Formulas for finding the surface area and volume of a sphere, sphere sector, spherical cap, and segment, zone, and lune of a sphere.
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 Spidron System  Daniel Erdely
Erdely calls a planar, planefilling object a Spidron. Upon threedimensional deformation subject to specific constraints, the planar system generates a regular, dynamic, geometrical construction. Erdely's experiments have led to the idea of creating
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 SPIMSOW: Swarthmore Summer Project for the Implementation of Mathematical Software on the Web  Bouttenot, Parlikar; Mathematics & Statistics Dept., Swarthmore College & Math Forum
The product of a 1998 summer project investigating current Weboriented mathematical software. The site explores the capabilities of the new Web versions of Mathematica, Maple, and MathView, offering tutorials on configuring the software and creating
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 Spinning to a Rolling Stop  Ivars Peterson (MathTrek)
The underlying mathematics of spinning disks. Spin a coin on a tabletop. As it loses energy and tips toward the surface, the coin begins to roll on its rim, wobbling faster and faster. Toward the end, the coin generates a characteristic rattling sound
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 Spirals of Primes  Bryan Clair, University of Chicago
This page will generate a spiral of numbers, with the primes marked as stars, and the composites as dots. The center of the spiral is marked with an 'X'. Specify the number at the center of the spiral below, and the width (and therefore also the height)
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 Spirals (The Geometry Junkyard)  David Eppstein, Theory Group, ICS, UC Irvine
An extensive annotated list of links to material on spirals of all kinds.
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 Spirograph  Anu Garg
A Spirograph is formed by rolling a circle inside or outside of another circle. The pen is placed at any point on the rolling circle. This applet has changeable colors as well.
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 Spliddit  Procaccia, Ariel; Goldman, Jonathan
Provably fair solutions to the everyday dilemmas of splitting rent, dividing goods, and sharing credit. Spliddit's algorithms account for individual rationality, efficiency, maximin share, proportionality, the highest feasibility level of fairness, impartiality,
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 Sport Science  ESPN Internet Ventures
ESPN videos that "uncover sports' biggest myths and mysteries by using cuttingedge technology to measure momentum, friction and the laws of gravity." Also available from http://espnrise.com/sportscience.
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 Sports Engineering Research Group  Matt Carré, Department of Mechanical Engineering, University of Sheffield (UK)
Research projects, equipment development, teaching and education in pursuit of fundamental questions about impact, friction, the aerodynamics of game balls, sports surfaces such as the traction of cleats and other footwear, and more. See, in particular,
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 Spreading Memes  Cut the Knot!, Alexander Bogomolny
First of a series of interactive columns for MAA Online that use Java applets to simulate a puzzle or mathematical problem, one not stated directly since the applets are intended to be such that the right answer to an as yet unstated problem should be
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 Spreading Rumors  Ivars Peterson (MathLand)
Three people take longer to share their gossip than four people! This curious result arises out of the following mathematical problem: A group of friends love sharing their gossip. Each gossiper initially knows something that no one else in the group
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 Spreading the Word  Keith Devlin (Devlin's Angle)
History of and commentary on early calculus texts. "The first calculus text hit the shelves in 1696. They have been growing steadily in size (if not mathematical content) ever since. That first genresetting volume was Guillaume Francois Antoine de l'Hospital's
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 Spreadsheet Basics  Jan Garner
Finding your way around spreadsheets; entering data; graphing with spreadsheets.
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 Spreadsheet Math  Sustainablearning, Inc.
Spreadsheets as laboratories where students can "become a scientist who poses a question, builds a model, collects data, and asks 'What if ...?'" Freely downloadable Excel files that emphasize student choice, challenge, and creativity range from place
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 Spreadsheets in Education  Baker, Sugden; Queensland, Australia
A new fully peerreviewed electronic journal devoted to the use of electronic spreadsheets, such as Microsoft Excel, in education. The editors invite manuscripts from education professionals who make use of spreadsheets for the benefit of their students.
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 Spreadsheets, Mathematics, Science, and Statistics Education  Erich Neuwirth
Information about spreadsheets with an emphasis on mathematics and statistics education. Spreadsheets in Education: Recommended Books; Papers about Spreadsheets in Scientific Journals and Books; Example Spreadsheets and Projects (mostly Excel 5.0); Further
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 SpreadsheetZONE  Pagos, Inc.
This repository of Microsoft Excel spreadsheet templates contains a category of math learning tools that covers topics such as base system conversion, exponential functions, logarithmic functions, Cartesian coordinates, derivatives, goodness of fit, polar
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 Springer Science Online  SpringerVerlag New York Inc.
SpringerVerlag (offices in New York, Barcelona, Berlin, Heidelberg, Hong Kong, London, Paris, Tokyo, and Vienna) has over 10,000 books in print, with 280 journals and magazines produced each year and over 1,500 new titles released annually to cover the
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 Springing a Physical Surprise  Ivars Peterson (MathTrek)
Consider a weight hanging from a spring, which in turn is suspended by a piece of string from an identical spring attached to the ceiling. Cutting the connecting string would send the weight and the lower spring plummeting to the floor. Now add two "safety"
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 Sprott's Fractal Gallery  Julien C. Sprott, Dept. of Physics, Univ. of Wisconsin
Images from programs and books by the site's author, with information about these books and software packages, and MSDOS software packages available for download. Every day a new fractal image is automatically generated on this page by a variation of
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 Sprouts for Spring  Ivars Peterson (MathLand)
The game of sprouts has a way of growing on you. This twoperson, pencilandpaper game is simple enough that children can play it. Yet its intricacies provide much food for mathematical thought. The players start with a certain number of dots scattered
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 Square/Cube Roots without a Calculator  Math Forum, Ask Dr. Math FAQ
How do you find the square root of a number by hand? How about cube roots?
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 Square of the Hypotenuse  Ivars Peterson (MathTrek)
Some history of the legend of the discovery of the Pythagorean theorem: in his textbook The History of Mathematics, Roger Cooke of the University of Vermont describes how the Babylonians might have discovered the Pythagorean theorem more than 1,000 years
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 Square Root Calculator  Chris Misenheimer
This interactive square root calculator calculates the square root of positive, negative, imaginary, and complex numbers, rounded to seven decimal places. Short articles include "Square roots and area," "Square roots without a calculator," and "What does
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 square root of negative one teach math  Amy Gruen
Blog by a high school math teacher in Kansas. Posts, which date back to December, 2010, have included "Stations Review and Practice," "The Loop for Logs," "My Thoughts On Homework," "Everyone Failed (and What's Up With Probability?)," "Visualizing Volumes,"
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 Square Roots without a Calculator  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about square roots without a calculator, from the divideandaverage technique to Newton's method to the continued fraction algorithm (CFA).
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 Squares and Square Roots, 1100  Math Forum, Ask Dr. Math Common Question
A table of squares and square roots, 1100.
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 Squares in a Checkerboard  Math Forum, Ask Dr. Math Common Question
A selection of answers to questions about how many squares or rectangles there are in a checkerboard or in an NxN square.
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 Square Wheel (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
A square wheel may be the ultimate flat tire. There's no way it can roll over a flat, smooth road without jolting the rider again and again. Stan Wagon, a mathematician at Macalester College in St. Paul, Minnesota, has a bicycle with square wheels. It's
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 Squaring the Circle  MacTutor Math History Archives
Linked essay covering the problem of squaring the circle in the form which we think of it today, which originated in Greek mathematics: given a circle, construct geometrically a square equal in area to the given circle. This article discusses the history
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 SR Education Associates, LLC  Steven Rasmussen
Consulting services in educational publishing, mathematics curriculum development, educational technology design and development, educational marketing, professional development for mathematics teachers, advocacy for mathematics and STEM education, and
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 Srinivasa Ramanujan Aiyangar  S.Prasad
A short biography of Ramanujan, with links to related Web pages.
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 Srinivasa Ramanujan  Sociedad Andaluza de Educación Matemática THALES
Biografía de Ramanujan: Presentación; Formación; Trabajo; En Cambridge; Su obra; Bibliografía; Otras páginas de interés
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 SsgtMath  Ricardo Sinclair
Ten to fifteen minutelong whiteboard introductions to Common Core State Standards (CCSS) ideas, geometry constructions, proofs, precollege algebra, college algebra, and more.
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 SStreams: Mathematica  Andrzej Kozlowski, Ed.; eNoteBooks Ltd.
Links to Mathematicarelated books and publications; developer, consulting and training companies; jobs requiring Mathematica; programs and packages to download free or for a fee; Web resources; and a section on skills: people with Mathematica programming
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 Standard Deviation, Part 1  Barbara Christopher
Can the standard deviation pick the most consistent set of numbers? or Which city's temperatures vary the least, San Diego or San Francisco? An interactive project in which students use the Internet to find statistical data for the mean, standard deviation,
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