What are some good science comparison projects/experiments?(Please read details)?

Hey, I need to do a science comparison project. For example, you could do "what type of chocolate melts the fastest", "what type of ball drops fastest", etc. Please give me AS MANY ideas as possible, even if you aren't sure(this project is urgent:P). If you have any helpful websites,... show more Hey,
I need to do a science comparison project. For example, you could do "what type of chocolate melts the fastest", "what type of ball drops fastest", etc.

Please give me AS MANY ideas as possible, even if you aren't sure(this project is urgent:P). If you have any helpful websites, please also let me know.
10 points will be awarded to best answer !

Thanks !
(L)
5 answers 5