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Retinal Implant Brightens Future for Blind

German doctors on Wednesday announced a breakthrough in retinal implants, the fledgling technology that aims to restore sight in people cursed by a form of inherited blindness.

Three patients fitted with the new device were able to see shapes and objects, and one was able to walk around a room by himself, approach people, read a clock face and distinguish between seven shades of grey.

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New York Noise Levels a Threat to Hearing

New York is still such a noisy city that its inhabitants could suffer from significant hearing loss in coming years, a study made public Wednesday has found.

Presented at a conference of the New York Academy of Medicine, the study found that 98 percent of noise measurements taken were at levels harmful to human health.

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Africa Launches Massive Anti-Polio Campaign

Fifteen countries in Africa are undertaking a mass polio immunization campaign for 72 million children this week, the World Health Organization said on Tuesday.

"This week Africa will be conducting a 15 country synchronized immunization campaign with oral vaccine," said Rod Curtis, a spokesman for the WHO in Geneva.

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New Polio Vaccine Raises Hope for Eradication

A new polio vaccine offers superior immunization and is raising hopes of a total eradication of the disease, according to a study published on Tuesday by British medical journal The Lancet.

There are three types of the polio virus, and while type 2 has been almost entirely eradicated since mass vaccinations began in 1988, types 1 and 3 remain a global health threat.

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Stemcells Coaxed to Rebuild Bone, Cartilage

Scientists have shown for the first time that it may be possible to replace a human hip or knee with a joint grown naturally inside the body using the patient's stem cells.

In experiments on rabbits, the researchers coaxed the animals' stem cells to rebuild the bone and cartilage of a missing leg joint, according to a study published on Thursday.

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