 A Glitch in Time  Ivars Peterson (MathLand)
On June 30, time stood still for one second. Clocks stopped and an additional second was added to the day. This adjustment was needed to bring the official time into agreement with Earth's eversoslowly decreasing rotation rate. It was the 21st leap
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 Glitter Trap (MatheMUSEments!)  Ivars Peterson (Math Muse for Kids)
You've probably looked at your distorted reflection in a shiny holiday ornament, but you may be surprised to learn what the reflections in a pyramid of silvery balls are like. The behavior of light in a stack of mirrored balls can help mathematicians
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 Global Climate Change: Research Explorer  the Exploratorium
Explore scientific data relating to the atmosphere, the oceans, the areas covered by ice and snow, and the living organisms in all these domains. Get a sense of how scientists study natural phenomena, how researchers gather evidence, test theories, and
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 Global Connections Online  National Semiconductor Corporation
A Webbased workshop that provides teachers with knowledge, skills, and support to incorporate the Internet in their classrooms and curricula. Learning objectives include explaining basic concepts relating to the Internet; using the features of a web
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 Global Math Department  Megan HayesGolding, community organizer
Professional development among math teachers sharing what they've learned "... 'cause we don't want our classes to suck the energy from students." Files have included "ZERO_Hit_Me_Game," "TINSpire_Quick_Tip," and "Zero_Game_Instructions." BigMarker community
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 The Global Schoolhouse  Global SchoolNet Foundation (GSN)
A site for teachers, parents, teens, and kids, with articles on telecommunication in the classroom, contests, events, projects, an alphabetical site index, and an annotated list of all articles. Formerly called FrEdMail (Free Educational Mail), GSN is
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 The Global Schoolhouse  Global SchoolNet Foundation (GSN)
The Global Schoolhouse focuses on projects for lifelong learning and uses the most powerful Internet tools, including live video, to link K12 classrooms to their communities and to other children around the world. Projects that discover and document
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 Global Student Network  Global Student Network, LLC
Provider of online homeschool curriculum, delivered entirely over the Internet. Over eighty courses for grades 212. Free online demo.
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 Global Sun Temperature Project  Stevens Institute of Technology, CIESE
An Internetbased multidisciplinary project (10 March  13 June 2003) that allows students to collaborate with other students and with experts online in determining how their locations affect their average daily temperature and hours of sunlight. Students
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 Globewide Network Academy (GNA)
A worldwide nonprofit consortium of educational and research organizations for support of online courses and distance education. Its mission is to improve education by creating a marketplace for courses as well as to offer administrative and technical
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 Glossary for Math Standards  OASIS
From Absolute Value to Volume  simple, short definitions/descriptions of math terms. From Online Activities for Standards in School (OASIS), a system for locating standardsbased Internet science and math curriculum materials and resources. A Colorado
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 Glossary  Interactive Mathematics Miscellany and Puzzles, Alexander Bogomolny
A glossary of terms that also serves as an alphabetical index to Bogomolny's site. Each term is linked to an illustrated essay.
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 Glossary of Internet Terms  Matisse Enzer
An ongoing project, currently comprised of over 100 terms from ADM to digerati to Router to WWW.
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 goENC.com  ENC Learning, Inc.
Resources and support for math and science educators needed to help raise student achievement in these vital subjects. Search over 27,000 print and multimedia curriculum resources and professional development materials. Webbased resources are only available
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 GoKnow!  GoKnow, Inc.
GoKnow, Inc. intends to be the leader in technology pervasive, standardsbased, scientifically validated curriculum and educational tools. GoKnow offers tools for handheld devices' use in the classroom, professional development and consulting services.
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 The Golden Mean  Rashomon (K. Wiedman)
The Golden Mean or Golden Section was derived by the ancient Greeks. Like pi, the number 1.618... is an irrational number. Both the ancient Greeks and the ancient Egyptians used the Golden Mean when designing their buildings and monuments. Links to pages
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 The Golden Ratio  Andi, Mel, and Shuj
An introduction to the golden ratio, also known as phi: its connection to the Fibonacci sequence, related constructions (star, line segment, rectangle, and spiral), and connections to biology, history, and aesthetics. Site also includes a glossary and
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 The Golden Ratio  Blacker, Polanski, Schwach; The Geometry Center
Introduction to the Golden Ratio and Fibonacci Sequence. Instead of simply supplying definitions and asking the student to engage in mindless practice, students work through several activities to discover the applications of the Golden Ratio and Fibonacci
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 Golden Ratio, Fibonacci Sequence  Math Forum, Ask Dr. Math FAQ
About the Golden Ratio (or Golden Section or Golden Mean), the Golden Rectangle, and the Fibonacci Sequence.
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 The Golden Ratio  John Kyrk
Animations for building the golden rectangle from the Fibonacci series; clockwise and counterclockwise spirals; how the proportions of the human body display the golden ratio.
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 The Golden ratio  MacTutor Math History Archives
Linked essay on the history of the golden ratio (golden number, golden section), from Euclid through Martin Ohm's book, Die reine ElementarMatematik. With references and other related web sites.
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 Golden Rectangle and Golden Ratio  Jim Loy
An introduction to the ratio involved in the Golden Rectangle, with a link to The Most Pleasing Rectangle Web Poll.
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 The Golden Rectangle (SMILE)  Edwina R. Justice, Gunsaulus Academy
A lesson for grades 68 designed to teach students to measure using metric units;
to calculate averages; to compare and round decimals; to use calculators; to examine the relation between the Fibonacci Sequence and the Golden Ratio; and to relate mathematics
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 The Golden Section In Art, Architecture and Music  Ron Knott
An introduction with illustrations and references to some applications and occurrences of the Fibonacci series and the Golden Ratio in architecture, art and music. The constant Phi has been used to design architecture, from the Parthenon in Athens to
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 Gold Medal Math  EdVenture Software
An educational software program which reinforces math skills through ten 3D animated Olympic events for students in grades 26. Site includes product description, screen shots, ordering and contact info. Typing program also available.
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 Google
A search engine that analyzes the way Web pages are linked to one another and automatically generates lists of Web resources based on frequency of linking.
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 Google Calculator
Google's calculator feature evaluates math expressions. The google.com and the Google Toolbar search boxes now handle queries such as: 56*78, half a cup in teaspoons, (G * mass of earth)/(radius of earth ^ 2), and 1.21 GW / 88 mph. Google provides instructions
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 Google Groups Discussion: TINspire  Rex Boggs, moderator
For users of the TINspire handheld, Rex Boggs has set up a moderated discussion group at Google Groups. The purpose of the discussion is to share knowledge and problems to make the technology more productive, enjoyable and enlightening. If you are interested
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 Google Public Data Explorer  Google Labs
The Google Public Data Explorer is available for beta testing and comment. It is designed to make large datasets easy to explore, visualize and communicate. As the charts and maps animate over time, the changes in the world become easier to understand.
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 Googol Learning  Susan Jarema
"It wasn't until I began teaching my own children math and had to relearn it that I began to see its beauty...." From the family publishers of the Discovery Multiplication Program, music such as "Multiplication Vacation," and other educational DVDs, games,
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 Googolplex  Frank Pilhofer
The American mathematician Edward Kasner once asked his nineyearold nephew to invent a name for a very large number, ten to the power of one hundred; and the boy called it a googol. He thought this was a number to overflow people's minds, being bigger
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 GO Solve Word Problems: Using graphic organizers to understand and solve word problems  Tom Snyder Productions
This software program teaches students to recognize mathematical situations in word problems, comprehend problems with the aid of graphic organizers, and plan solutions with addition, subtraction, multiplication, and division. The program has instruction
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 Goudreau Museum of Mathematics in Art & Science  Stephanie Killian
When you visit the Math Museum in New York, you can build a math model; explore games and puzzles; view exhibits demonstrating how math is used in the arts and sciences; experience challenging but nonthreatening specialized programs and workshops in math;
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 Government Affairs and Education (AMS)  American Mathematical Society
Government Affairs: news from Washington on science funding; calls for action; policy statements; recent statements by the mathematical community; federal budget information; how to contact Congress; science policy events; and a link to the AMS Committee
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 Grades 912 Data Analysis and Probability (MSTE)  University of Illinois at UrbanaChampaign (UIUC)
A list of statistics resources from the Office of Mathematics, Science and Technology Education (MSTE), including lessons and useful data sets, organized to follow the NCTM Statistics Standards for grades 912. Links to the AP Statistics site and even
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 Grafica Obscura  Paul Haeberli
An evolving computer graphics notebook: a compilation of technical notes, pictures and essays. Contents include: Paper and Plotter: A 3D Surface; Laser Cutting for Rapid Manufacturing; Geometric Paper Folding: Dr. David Huffman; Paper and Light (An inexpensive
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 Grand Illusions  Hendrik Ball
A "site for the enquiring mind, with optical illusions, scientific toys, visual effects, and even a little magic." Includes a number of feature articles on vision, photography, mirrors, optical toys, movies, etc. See, in particular, the geometrical optical
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 Grandma Got STEM  Rachel Levy
Levy, a Professor in the Mathematics Department at Harvey Mudd College, blogs to collect public awareness and art projects that use grandmothers' pictures, names, and connections to science, technology, engineering, and mathematics (STEM) in order to
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 Grant Wrangler  Nimble Press
Searching this free grant listing service for the category math pulls up deadlines and capsule descriptions of dozens of funding opportunities for math teachers.
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 Grapher  Cary and Michael Huang
Enter a linear, quadratic, cubic, trigonometric, logarithmic, or other equation, then press an "evaluate" button to watch it render on the Cartesian plane, from left to right. Vary speeds and colors; zoom in and out.
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 Graphing Applet  Greg Vogl
This graphing Java applet illustrates variable substitution and function composition by encouraging the user to experiment with variables and look at a range of functions  logarithmic, trigonometric, exponential, and more. Parameters include xmin and
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 Graphing Calculator for Mac and Windows  Pacific Tech
Graphing Calculator calculates and displays two and threedimensional mathematical objects easily, and saves animations as QuickTime movies. The site includes a list of features, a guided tour, a picture gallery, a free demo, and ordering capabilities,
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 Graphing Calculator Help  PearsonHall Education
Help using the calculator models TI82, TI83, TI85, TI86, TI89, TI92, HP48G, CFX9850 GaPlus, Sharp EL9600C, and Casio FX2. Select a model to display PrenticeHall's help topics in alphabetical order, then click the topic to see specific instructions.
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 Graphing Game (SMILE)  Thomas Lalagos, Hyde Park Career Academy
A lesson that introduces the graphing of ordered pairs on the cartesian plane. From the Recreational and Creative Math section of a collection of almost 200 single concept lessons by the Science and Mathematics Initiative for Learning Enhancement.
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 Graphing Linear Equations on a Palm  Suzanne Alejandre
A middle school lesson using ImagiGraph and a Palm OS handheld to help students learn about linear equations. Includes information on where to try and/or buy the software.
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 Graphing Ozone Chemistry  The Exploratorium
A simple "howto" graphing example followed by other more sophisticated examples of graphing using NASA images and images from the Neumayer Antarctic Station. Also includes additional discussion questions concerning the social and economic aspects of
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 Graphing Stories  Dan Meyer and the BuzzMath Team
Videos, each 102 seconds in length, of stories for students to graph using the freely downloadable accompanying student template. Select from among constant, decreasing, increasing, linear, parabolic, periodic, piecewise, and step graphs; story subjects
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 Graphing with Excel  LabWrite Project Team
Tutorial modules for visualizing data in Excel: data input into cells, creating a scatter plot and line graph, bar graphs and histograms, importing text files, final formatting, regression lines, superimposing graphs, descriptive statistics, and selecting
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 GraphPouch  Edcodia LLC
This iPad app lets you create graphing worksheets, use familiar PEMDAS operators to construct graphs, graph multiple equations per graph, reorganize them with draganddrop, "smart snap" to align objects, and more. Also available directly from the iTunes
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 GraphVisualizer  Terje Tysse
An applet that graphs simple functions, listed on the help page, over various user specified ranges.
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