whivh are the best and interactive kool site for science ????

Answer 1

I haven't checked all these out, but the following link will get you to a page that has lots of interactive sites.
http://jc-schools.net/tutorials/interactive.htm#Science

You could also try
http://www2.nsta.org/sciencesites/

Or:
http://www.globalclassroom.org/2005/inservice/science.html

And:
http://www.oakfield.w-sussex.sch.uk/sciencewebsites.html

Didn't find anything you like? Google "interactive science websites" and see if anything pops out. Happy hunting!