3 new stacks in the education gallery

[Marielle Lange]

3 new stacks have been added to the education gallery:
http://revolution.lexicall.org/stacks_education.php

(1) A pivot table utility by me       (under research tools)
And two stacks mentioned this week on the use-revolution list:
(2) Line Intersection by Jim Hurley   (under courseware->math)
(3) Physics stuff by Roger Guay     (under courseware->physics)

The pivot table utility is a small tool to help summarize data  
according to predefined dimensions. You will find explanations at:
http://revolution.lexicall.org/paypal/pivot_table/
This is an early version and comments and feedback are appreciated.  
It would be nice to have some "drag and drop" features like in Excel,  
feel free to add this to the stack (share alike license).

Best,
Marielle

PS. Bugs have also been fixed in the trim outliers application:
http://revolution.lexicall.org/paypal/trim_outliers/. The url has  
changed slightly too, but a redirection has now been set for all of  
the old links I had given.
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Marielle Lange (PhD),  Psycholinguistics, Lecturer in Psychology and  
Informatics
University of Edinburgh, UK

Homepage:  http://homepages.inf.ed.ac.uk/mlange/
Lexicall project: http://lexicall.org
Revolution-education project: http://revolution.lexicall.org