Science "Fair" Projects

Frankly I don't think they really teach science. Because lots of times students do stuff thats really easy. They don't teach you really anything. Only one specific answer to the one question you asked, I think they aren't necessary and we shouldn't be forced to do them just to get a good grade. 

Stem Cells

Well, obviously were not going to KILL someone to study and/or use their stem cells, so frankly i think using stem cells is good. For studying them mostly, so that we can find out more about them and how to us them in future surgeries. Because its always good to know more things, and using stem cells will teach us more things.