Science Buddies: "Ask an Expert"

I am doing a science fair project of the naked egg experiment. I am using the vinegar to break down the eggs and then will test the strength of the eggs by dropping the eggs at different heights. I was told I need a control. What can be the control. Thanks.

A good control would be not using any vinegar at all, as a negative control, and this might be completely irrelevant (I've never done this type of experiment before), but would using a hard boiled egg as a positive control make sense? Just a thought.
Hope this helps.

Thanks for suggestion.