Adult sea turtles find their way back to the beaches where they hatched by seeking out unique magnetic signatures along the coast, according to new evidence.

"Sea turtles migrate across thousands of miles of ocean before returning to nest on the same stretch of coastline where they hatched, but how they do this has mystified scientists for more than fifty years," says J. Roger Brothers of the University of North Carolina, Chapel Hill. "Our results provide evidence that turtles imprint on the unique magnetic field of their natal beach as hatchlings and then use this information to return as adults."

A new study found a causal link between the activation of serotonin neurons and the amount of time mice are willing to wait, and rejected a possible link between increased serotonin neuron activation and reward.

Serotonin is a neuromodulatory chemical that is targeted by antidepressant drugs, such as Prozac, which are widely used to treat depression and other disorders such as chronic pain. Serotonin is normally released by a small set of cells in an area of the brain called the raphe nuclei. However, what naturally causes these neurons to become active and release serotonin and how this affects brain function are still poorly understood.

A National Institutes of Health white paper that was released today finds little to no evidence for the effectiveness of opioid drugs in the treatment of long-term chronic pain, despite the explosive recent growth in the use of the drugs.

The paper, which constitutes the final report of a seven-member panel convened by the NIH last September, finds that many of the studies used to justify the prescription of these drugs were either poorly conducted or of an insufficient duration.

An NIH white paper finds little to no evidence for the effectiveness of opioid drugs in the treatment of long-term chronic pain.

A study has found that reducing expression of the Myc gene - found in the genomes of all animals, ranging from ancestral single-celled organisms to humans - significantly increased the healthy lifespan of laboratory mice, the first such finding regarding this gene in a mammalian species.

Myc is a major topic of biomedical research and has been shown to be a central regulator of cell proliferation, growth, and death. Though animals cannot live without it, in humans and mice too much expression of the protein that Myc encodes has been closely linked to cancer, making it a well-known but elusive target of drug developers.

Political conservatives in the United States are somewhat like East Asians in the way they think, categorize and perceive, while liberals in the U.S. are more extreme in thought, categorization and perception, according to a new cultural psychology analysis.

We use our hands a lot each day. Humans have highly developed fine motor skills and so we are able to perform grasping movements with variable precision and power distribution, everything from tying our shoelaces to holding a balloon.