Well, when you have an ear infection, it is usually due to having water in your ears, And not removing it (usually from swimming). Or if you have a build of ear wax in your ear, and you did not treat it.
You can fix this problem, by putting some peroxide into the infected ear. After you have done that you should leave it alone. If the pain gets worse, you should go see a doctor.
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A. a device used to prevent pregnancy and disease.
Yes it does because the larger the brain is the more room it has to do electricity in the brain