Hello! First of all I love your website. It gives great advise for the kiddos preparing for their science project and for the parents that have not been in school for over 30 years! My son is doing a science project on various types of cooking oils (vegetable, olive, canola, and corn) used to determine what oil will pop the most kernals. I am not sure how to get him started. In addition, is it okay to use four different oils as the variables. What should be our constants? I am assuming the independent variable will be the variety of oils, the dependent variable will be the number of popped kernals What would be the control? In addition, I am not sure what the hypothesis would be? Any suggestion or advise would be greatly appreciated!