Subject: What are non-Newtonian fluids?

What are non-Newtonian fluids?
About a year ago my day came home from work( he's a physicist and 
I'm using his e-mail account) and told me to put some corn starch 
and water in a balloon.  I'm now doing a science project and 
thought it woukd be cool to do some thing with corn starch and 
water, but we're (my dad and I) having a very hard time finding info. about 
non-Newtonian fluids( what it is).  It would help a lot if you 
could send me some general info. on this.   Thanks!!  

Re:What are non-Newtonian fluids?