Oh my word... if you have not heard about the Oreo Challenge, you NEED to check out this website:
OREO Challenge. My students had a BLAST with this project, and there is so much that you can do with it. My students keep asking if they can do it again! If you decide to have this challenge with your class, and you want to Skype about it let me know! We love Skype in our classroom and we are always up for a Skype visit :)
For our challenge I created a sheet (i will upload this in another post) to go with this... we estimated, graphed our results, tallied our results, and wrote a cute book (pictures coming later).