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As humans age, their hearing naturally grows less acute because they begin to lose tiny sensory hairs (pictured, magnified) in their inner ears that convert sound waves into neurological signals. But now scientists have figured out how to genetically-engineer the cells that generate these sensory hairs. This is a boon for people who are losing their hearing, but it could also lead to super-hearing. Add more sensory hairs to an ear that's in good condition, and you might get someone who is more sensitive to sound. More »
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