Chronic exposure to dim light at night can lead to depressive symptoms in rodents -- but these negative effects can be reversed simply by returning to a standard light-dark cycle, a new study suggests.

While hamsters exposed to light at night for four weeks showed evidence of depressive symptoms, those symptoms essentially disappeared after about two weeks if they returned to normal lighting conditions.

Even changes in the brain that occurred after hamsters lived with chronic light at night reversed themselves after returning to a more normal light cycle.

These findings add to the growing evidence that suggest chronic exposure to artificial light at night may play some role in the rising rates of depression in humans during the past 50 years, said Tracy Bedrosian, lead author of the study and doctoral student in neuroscience at Ohio State University.

"The results we found in hamsters are consistent with what we know about depression in humans," Bedrosian said.

But the new study, published online in the journal Molecular Psychiatry, also offers some hope.

It was big news when court documents were unsealed revealing a whistleblower lawsuit accusing drug giant Merck of fraud and lying about the true efficacy of its mumps vaccine. Just about every media, large and small, picked it up and the world was abuzz about the hundreds of millions of dollars the lawsuit claimed Merck had defrauded from the U.S. government.

The Wall Street Journal published the story in the form of a Dow Jones news release written by Jon Kamp on June 22, 2012, and links to the story began popping up on social media like Facebook.

Then, suddenly, the link to the story no longer worked, and if anyone clicked on the link in social media, it would show up "page not found." Apparently the story had been pulled, and when search engines and Internet archives wouldn't even show it, it looked as if it had never been published on the Journal's site at all. It was erased nearly clean--except for a small stock-watcher's website, 4Traders.com, which did a good job of erasing it from its main site but didn't catch it in the cache.

The question is, why did the WSJ pull the story and try to erase as if it never existed when there were actual court documents for evidence?

OMNIVORE

1. Grow up on a crappy omnivore diet that includes a lot of junk food and boring home-cooked meals. In the suburbs, ideally. When you meet your first vegan, ask where they get their protein. Say you love cheese too much to ever give it up. Convince yourself there was a strip of leather somewhere on their shoes.

2. Realize how f[****] up it is that animals die so you can eat a McNugget. Go vegetarian.

VEGETARIAN

3. Openly judge meat eaters. Anti-meat militancy often peaks early as you distance your new compassionate identity from your shameful recent past. Lecture mom about the evil of bacon while you pick the remnants of last night's Sloppy Joe out of your teeth.

4. Get annoyed when vegans say you're inconsistent for giving up meat but not dairy and eggs. Make fun of those extremist vegans with your meat eating pals to demonstrate how comparatively sane you are.

5. Finally admit that vegetarianism is inconsistent. You don't eat meat because it causes animal suffering and death, but dairy and eggs cause animal suffering and death. Experience cognitive dissonance. Go vegan.

Severe psychological and physical neglect produces measurable changes in children's brains, finds a study led by Boston Children's Hospital. But the study also suggests that positive interventions can partially reverse these changes.

Researchers led by Margaret Sheridan, PhD, and Charles Nelson, PhD, of the Labs of Cognitive Neuroscience at Boston Children's Hospital, analyzed brain MRI scans from Romanian children in the ongoing Bucharest Early Intervention Project (BEIP), which has transferred some children reared in orphanages into quality foster care homes.

Their findings, published in the Proceedings of the National Academy of Sciences (Early Edition, online the week of July 23), add to earlier studies by Nelson and colleagues showing cognitive impairment in institutionalized children, but also showing improvements when children are placed in good foster homes.

Infants are able to detect how speech communicates unobservable intentions, researchers at New York University and McGill University have found in a study that sheds new light on how early in life we can rely on language to acquire knowledge about matters that go beyond first-hand experiences.

Their findings appear in the Proceedings of the National Academy of Sciences (PNAS).

"Much of what we know about the world does not come from our own experiences, so we have to obtain this information indirectly -- from books, the news media, and conversation," explained Athena Vouloumanos, an assistant professor at NYU and one of the study's co-authors. "Our results show infants can acquire knowledge in much the same way -- through language, or, specifically, spoken descriptions of phenomena they haven't -- or that can't be -- directly observed."

The study's other co-authors were Kristine Onishi, an associate professor in the Department of Psychology at Canada's McGill University, and Amanda Pogue, a former research assistant at NYU who is now a graduate student at the University of Waterloo.

Chicago -Should all U.S. children get tested for high cholesterol? Doctors are still debating that question months after a government-appointed panel recommended widespread screening that would lead to prescribing medicine for some kids.

Fresh criticism was published online Monday in Pediatrics by researchers at one university who say the guidelines are too aggressive and were influenced by panel members' financial ties to drugmakers.

Eight of the 14 guidelines panel members reported industry ties and disclosed that when their advice was published in December. They contend in a rebuttal article in Pediatrics that company payments covered costs of evaluating whether the drugs are safe and effective but did not influence the recommendations.

It also is not uncommon for experts in their fields to have received some consulting fees from drug companies.

Even so, the ties pose a conflict of interest that "undermines the credibility of both the guidelines and the process through which they were produced," says the commentary by researchers at the University of California at San Francisco. The authors are Dr. Thomas Newman, a researcher and former member of a Food and Drug Administration pediatrics advisory committee, and two heart disease researchers, Drs. Mark Pletcher and Stephen Hulley.

Pletcher has received research funding from drug and device makers; the other authors said they had no relevant industry ties.

Other criticism was published earlier this year in the Journal of the American Medical Association. That critique raised concerns about putting children on cholesterol drugs called statins, noting the medicine has been linked with a rare muscle-damaging condition in adults. Those authors were heart specialist Bruce Psaty and pediatrician Frederick Rivara, both of the University of Washington in Seattle.

JAMA included additional criticism from a dissenting member of the panel that produced the kids' cholesterol guidelines, Dr. Matthew Gillman of Harvard Medical School. He recommends more narrow screening based on family history of cholesterol problems.

Training sessions for major sports events are gruelling. For mere mortals they can appear to be the pastime of superheroes.

Not only are there intense hours of high-performance exercises but some sportsmen like Britain's athlete Mo Farah adopt weird and inventive methods to increase their performance.

According to the Samsung Global Blogger, Farah uses an anti-gravity device and underwater treadmill to supplement his 195km-a-week running regime.

For many, cooling down after exercise involves a gentle stretch of the calf muscles and a bending over to the left and right of the abdomen - nothing too strenuous .

But Farah spends time in ice chambers that use liquid nitrogen. This might seem weird, but taking an ice bath after training has become standard practice.

Cooling or recovery techniques used usually include more traditional methods such as massage, stretching sessions, steam baths, yoga and swimming. But many athletes now claim that plunging into a tub of ice water (about 6C) after exercise increases their rate of recovery and helps reduce muscle pain.

Rocco Meiring, a swimming coach at Pretoria University's High Performance Centre, says: "This method is used for leg-intensive sports like rugby, soccer, cricket and athletics. Ice baths are often used in combination with hot baths or saunas after an intense training session or conditioning work."

So, how does an ice bath, and the combination of cold and hot, improve the speed and quality of recovery? Is there evidence that it works?

Poor mothers are more likely to be classified as having the mental illness known as generalized anxiety disorder (GAD) because they live in poverty -- not because they are suffering from a psychiatric disorder, according to Rutgers researchers.

Judith C. Baer, an associate professor in the School of Social Work, and her team, in the study, "Is it Generalized Anxiety Disorder or Poverty? An Examination of Poor Mothers and Their Children," published online in Child and Adolescent Social Work, argue that although high levels of stress over long periods can lead to psychological problems, there is no evidence that generalized anxiety disorder in poor mothers is because of an "internal malfunction."

The findings confirm earlier studies that the poorest mothers have the greater odds of being classified as having generalized anxiety disorder. But Baer and her team wrote, ." ..there is no evidence for a malfunction of some internal mechanism. Rather, "there is a physical need in the real world that is unmet and produces anxiety."

Researchers at the Stanford University School of Medicine and Lucile Packard Children's Hospital have identified several gene mutations responsible for the most common childhood brain tumor, called medulloblastoma, adding evidence to the theory that the diagnosis is a group of genetically distinct cancers with different prognoses. These and accompanying findings are likely to lead to less-toxic, better-targeted treatment approaches over the next two years, the researchers said.

"We tend to treat all medulloblastomas as one disease without taking into account how heterogeneous the tumors are at the molecular level," said Yoon-Jae Cho, MD, an assistant professor of neurology and neurological sciences at Stanford, a pediatric neurologist at Packard Children's and the senior author of the new research. "This paper represents a finer-grained view of the genetic landscape of these tumors and provides us with some leads on how to develop new therapies."

The research, which appeared online in Nature July 22, is part of a large, ongoing effort to characterize genetic errors in medulloblastoma. Two companion studies on which Cho is a co-author will be published simultaneously with his paper. The three papers came from a consortium that involves scientists at Stanford, Packard Children's, the Broad Institute, Children's Hospital Boston, the Dana-Farber Cancer Institute, the German Cancer Research Center, Brandeis University and the Hospital for Sick Children in Toronto.

Coffee: is it good or bad for us?

You might get media whiplash trying to figure that out. The truth is, I find this subject to be as confusing as you probably do. After all, the media certainly doesn't help clarify whether America's favorite cup of joe is going to land you in the Doc's office or set you free with a clean bill of health.

And when one night's news report conflicts with another's blatantly contradictory messages, it is no wonder why so many of you shrug your shoulders in utter confusion as you refill your morning mug and get on with your day! And with the velvety aroma and promise of energy from that caffeine jolt, you might rather just assume that there must be something to those beneficial claims...

I know all about this adoration of coffee.

I too was smitten and enamored with Coffea Arabica. We had our courtship during the 1990's when I worked over 80 hours in the emergency room and saw 30 to 40 patients a day. I traded sleep for espresso, authentic energy for Haagen Daz coffee ice cream and normal circadian rhythms for high speed caffeinated adrenaline rushes.