Genetically-Engineered Hairs Improve the Human Ear

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… » 8/27/08 2:02pm 8/27/08 2:02pm