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A government study of "cancer villages" along a major Chinese river suggests economic growth is taking a heavy toll on the environment, officials say.

A rising cancer rate has been detected in regions along the Huaihe River, Yang Gonghuan, former deputy director of the Chinese Center for Disease Control and Prevention, said. The cancer rate in the affected areas was 50 percent higher than the national average of 0.25 percent in 2004-05, the study found.

CNN's chief medical correspondent Dr. Sanjay Gupta apologized Wednesday for publicly opposing marijuana legalization, saying there was "no scientific basis" to claim marijuana had no medical benefits.

"I think we have been terribly and systematically misled in this country for some time, and I did part of that misleading," he said.

Fulfilling a campaign promise, Gov. Maggie Hassan signed a law Tuesday making New Hampshire the 19th state to allow seriously ill residents to use marijuana to treat their illnesses.

"Allowing doctors to provide relief to patients through the use of appropriately regulated and dispensed medical marijuana is the compassionate and right policy for the state of New Hampshire, and this legislation ensures that we approach this policy in the right way with measures to prevent abuse," Hassan said in a statement.

The prospect of reversing blindness has made a significant leap, according to scientists in the UK. An animal study in the journal Nature Biotechnology showed the part of the eye which actually detects light can be repaired using stem cells.

The team at Moorfields Eye Hospital and University College London say human trials are now, for the first time, a realistic prospect.

Experts described it as a "significant breakthrough" and "huge leap" forward.

Officials at the Environmental Working Group say four compounds are most effective at warding off mosquitoes without risking a person's health.

"While consumers are aware that bug bites may affect their health, many people are also concerned about the possible drawbacks of common repellents such as DEET," David Andrews, senior scientist at EWG, said in a statement. "It is hard to find objective scientific evaluations of the many different repellents on the market."

By 2012, Eastman Chemical seemed to be perfectly positioned when it came to producing plastic for drinking bottles. Concerns about a widely used chemical called bisphenol A (BPA) had become so great that Walmart stopped selling plastic baby bottles and children's sippy cups made with it and consumer groups were clamoring for regulators to ban it.

Medical societies were warning that BPA's similarity to estrogens could disrupt the human hormone system and pose health risks, especially to fetuses and newborns.