A study about two major pitfalls impeding achievement of the desired social interaction in CSCL environments which are defined as; taking social interaction in groups for granted and the lack of attention paid to the social psychological dimension of social interaction outside of the task context

About the book I have mentioned on gender issue

Something about how language functions. I especially suggest you to check Broca and Wernick areas, which are really interesting.

Here is a video showing how a tutor works

Actually the skills are predetermined and while learners study the tutors monitor their performance and learning by the help of some algorithms called model tracing and knowledge tracing. So according to the learner's performence the tutor changes the expected skills

A nice book enjoyable to read, which includes interesting ideas about thinking, computers and cognitive sciences

Actually I have just checked it and it is working but if you still have problem to reach the book please try this link: http://www.martinshaven.com/Resources/Hofstadter%20-%20Godel-Escher-Bach.pdf

Canan did you try the second link I have added? In fact, he is an artist, but Gödel is. Yet, while trying to explain the nature of meaning, the book gets help from some works by Gödel, Escher and Bach, all of which similarly acquire their meanings by self-referencing and creating formal rules made of meaningless elements. So it is possible to say he is mathematically inspired :) and I like that paradoxal piece too.