Clinical trials can assess impact of a medication on a disease. The ideal design is 'blind' – when the researchers and participants do not know who is assigned to the different treatments.
For some children, ear infections will become a persistent problem.
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Matthew Xu-Friedman, University at Buffalo, The State University of New York
Noise is common, but we don't fully know what that means for our hearing. A recent study suggests how overstimulation of the auditory nerve may be too much for it to handle.