By now you have probably found them - sorry you didn't get a response sooner. In the future, when asking a question, try to provide more detail to help the people on the other end provide an appropriate answer. Like, how old are you (or in what grade)? It makes a lot of difference if I'm responding to a 4th grader vs a high school student! And what is your goal? A science fair project? Hope it worked out for you.