An analysis of marijuana-related Twitter messages sent during a one-month period in early 2014, shows that the "Twitterverse" is a pot-friendly place.

How friendly? 15X as many pro-pot Tweets as anti-pot ones among more than 7 million tweets referenced marijuana.

What is the explanation for that? People who don't smoke a lot of pot are likely at work while those sending and receiving pot tweets were under age 25, with many in their teens, a demographic group at increased risk for developing marijuana dependence and other drug-related problems. 

Scientists have described a unique monoclonal antibody with the potential to treat Staphylococcus aureus (S. aureus) infections through the simultaneous neutralization of multiple key toxins produced by S. aureus, including alpha-hemolysin and four additional leukocidins. The findings are published online this week in the journal mAbs and demonstrate superior in vitro potency compared to antibodies targeting alpha-hemolysin alone. The mAb also shows high protective efficacy from lethal S. aureus infections in several animal models.

How is it that people can sometimes show such empathy when other times our ability to feel compassion seems to be in such short supply? A study published in the Cell Press journal Current Biology on January 15 shows that stress is a major factor.

A drug that blocks stress hormones increases the ability of college students and mice to "feel" the pain of a stranger, the study shows. That phenomenon, known as "emotional contagion of pain," is one form of empathy. In even better news, a shared round of the video game Rock Band worked just as well as the drugs among those undergrads.

Fortifying food with folic acid saves about 1,300 babies each year from serious birth defects of the brain and spine known as neural tube defects (NTDs), according to new data published by the US Centers for Disease Control and Prevention in Morbidity and Mortality Weekly Report.The number of babies born in the United States with these conditions has declined by 35 percent since 1998.

About 3,000 pregnancies in the U.S. still are affected by neural tube defects annually. The March of Dimes says that even with folic acid-fortified grain products, many women still may not be getting enough folic acid so they recommend that all women take vitamins containing folic acid, though only about one-third of women do.

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.