Marta Kohl - Vygotsky .

http://www.youtube.com/watch?v=2qnBE_8A6Fk
http://www.youtube.com/watch?v=TpFLOsoyKTA
http://www.youtube.com/watch?v=apDADNFTUQA
http://www.youtube.com/watch?v=QSOBXfcHbHI
http://www.youtube.com/watch?v=mj2XBkwTVDw
http://www.youtube.com/watch?v=EapR3rNTkAs