This is great for life science and the human body:

 http://kidshealth.org/kid/htbw/htbw_main_page.html

 

 

 This is a great site but remember that it's called   "reSEARCH".  You may need to keep clicking on links to get to where you need to be!

 http://academickids.com/   

 

These songs are fun, but the videos are more informative:   http://studyjams.scholastic.com/studyjams/index.htm

 

This is also a great avenue for research.  It will bring you to other sites like the Franklin Institute, for example:

http://sciencespot.net/Pages/kidzone.html 

 

There are lots of great songs on this site, fun but still informative.   It would be a great site for general information: 

http://studyjams.scholastic.com/studyjams/jams/science/index.htm