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学生说明
1. Click the green add button
2. Draw your prediction
3. Record your prediction
4. Click the green check mark to save your work
5. After you are done experimenting/talking to the teacher record a comment 
on your prediction to say what happened.
教师备注（学生不可见）
Experiment #3: Shaving Cream w/food Color Shaving cream on a plate or in a glass Add 3-4 drops of food color (Before adding: “What will happen?”) Stir (After stirring: “Did anything change?”)
