Tabula Digita  Dimenxian
http://www.dimenxian.com?ref=mf1
Tabula Digita, in conjunction with The Princeton Review, is creating video games that teach algebra and prealgebra concepts. Students experience, explore, and apply math concepts in an engaging threedimensional virtual world.
The topics covered in Dimenxian include:
 coordinate system and scatter plots
 investigation of linear relationships
 data analysis and identification of linear relationships
 application of linear relationships
 graphing of linear equations using intercepts
Download the PC Demo or signup to be notified when the Macintosh version is available.
If you enjoy the demo, preorder and save over 20% on the first release mission pack of Dimenxian. The price of $21.95 will be good only until the launch date this summer.
Arch History & Architectural Overview
http://www.nps.gov/jeff/archov.htm
If you were in St. Louis last week participating in the annual meeting of the National Council of Teachers of Mathematics (NCTM), you may have taken an opportunity to visit the Gateway Arch. This page from the National Park Service includes an animated slide show of the Arch's construction, along with other information about the 630 foottall structure, which was modeled after the hyperbolic cosine function:
http://www.nps.gov/jeff/archslides.htm
Wikipedia also has this informative page:
http://en.wikipedia.org/wiki/Jefferson_National_Expansion_Memorial
We think there is a good opportunity for a Problem of the Week here! In fact, if you are a Problem of the Week subscriber, check out the new GeoPoW "Look West!" currently in preview, which will be active this Monday:
http://mathforum.org/geopow/
Math Forum Presentations at NCSM 2006
http://mathforum.org/workshops/nctm2006/index.ncsm.html
The handout information from our recent presentations in St. Louis is available here:
 Session 32 by Cynthia Lanius and Suzanne Alejandre
 Building Teacher Pedagogic Content Knowledge through Problem Solving
 http://mathforum.org/workshops/nctm2006/session32.html

 Session 174 by Stephen Weimar and Annie Fetter
 Assessing Problem Solving Using ConstructedResponse Problems
 http://mathforum.org/workshops/nctm2006/ncsm_2006_talk.pdf
Math Forum Presentations at NCTM 2006
http://mathforum.org/workshops/nctm2006/
 Session 373 by Johann Sarmiento and Stephen Weimar
 Assessing Mathematical Thinking from Online, Collaborative Problemsolving
 http://mathforum.org/workshops/nctm2006/vmt.html

 Session 497 by Steve Risberg
 Asking and Answering Good Questions: Online Inquiry as Assessment
 http://mathforum.org/workshops/nctm2006/goodquestions.html

 Session 503 by Claire Mead and Klay Kruczek
 Online Mentoring Project Prepares Future Teachers to Foster Problem Solvers
 http://mathforum.org/~claire/omp/

 Session 670 by Suzanne Alejandre and Cynthia Lanius
 The Math Forum @ Drexel: Technology Enhances Problem Solving and Assessment
 http://mathforum.org/workshops/nctm2006/session670.html

 Session 748 by Annie Fetter and Steve Weimar
 Assessing Problem Solving and Writing with Constructed Response Problems
 http://mathforum.org/workshops/nctm2006/session748.pdf

 Session 889 by Jacquie McDonald and Cynthia Lanius
 Teaching with Technology: ONMath Investigations
 http://mathforum.org/workshops/nctm2006/ONMath.ppt
NLVM  Spanish Version
Biblioteca National de Manipuladores Virtuales
http://nlvm.usu.edu/es/nav/index.html
Joel Duffin announced that on Monday, May 1, the Spanish version of the National Library of Virtual Manipulatives (NLVM) website was released. On any page of the website, users can easily switch between English and Spanish by using a dropdown menu.
These translations benefit Spanish speakers learning English, as well as Spanishonly speakers.
If you have feedback for the developers at Utah State University who have provided this site, please use the information posted on their contact page to send them a note:
http://nlvm.usu.edu/es/nav/contactinfo.html
