The result will usually be that the vinegar cleans the pennies better, demonstrating that a lower-pH solution is better at cleaning discoloration due to oxidation. The volume of liquid and the material of the penny are both controlled variables in this experiment. This experiment is especially good for teaching the concept of a controlled variable if you include a third variable -- how dirty the pennies are.
1 doctor agreed: Yes: Pinworm symptoms can include gastrointestinal upset, anal or vaginal itchiness, loss of appetite, difficulty sleeping, irritability, restlessness. Untreated pinworm infection can lead to weight loss, diarrhea, genital rash, urinary incontinence and vaginal discharge.
Most diarrhea is due to self-limited, mild infections of the colon or small intestine. Salmonellosis: The bacteria Salmonella can contaminate food and infect the intestine. Salmonella causes diarrhea and stomach cramps, which usually resolve without treatment. Shigellosis: The bacteria Shigella can contaminate food and invade the colon. Symptoms include fever, stomach cramps, and diarrhea, which may be bloody. Travelers' diarrhea: Many different bacteria commonly contaminate water or food in developing countries.