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.

An analysis of Danish women of reproductive age suggests that long-term use of hormonal contraceptives is associated with an increased risk of brain tumors.

 Hormonal contraceptives, commonly called "the pill" in oral contraceptive, contain female sex hormones and are commonly referenced as the foundation of the "sexual revolution" in the 1960s because widespread usage has given women all over the world control over childbearing.

In the brain, blood flow and cognitive function peak during young adulthood, but a new study of 52 young women found that oxygen availability, which is known to positively relate to brain health and function, is higher in adults who exercise regularly.

Women who exercised on a regular basis had higher oxygen availability in the anterior frontal region of the brain and performed best on difficult cognitive tasks.

“Our findings suggest that regular engagement in physical activity may improve brain functioning even in young adults in their prime,” said Dr. Liana Machado, senior author of the Psychophysiology study. “Both blood supply to the brain and cognitive functioning appear to benefit from regular exercise.

If someone won't move around for 20 minutes a day, can anything more be done to help people get off the couch?

Too much sitting has been linked to increased risk of chronic diseases such as diabetes, heart disease and some types of cancer. Current guidelines suggest adults do 150 minutes of moderate intensity activity a week, but more than a third (35.6%) of adults worldwide don't do that. And the proportion of time spent being inactive rises with age: from 55% (7.7 hours) at 20-29 years, to 67% (9.6 hours) in those aged 70-79 years.

The use of animal translocations as a means to mitigate construction projects and other human developments is a widespread animal-management tool. A paper published today, produced through collaboration of conservationists from San Diego Zoo Global, the U.S. Fish and Wildlife Service, University of Kent UK, University of Newcastle and Amphibian and Reptile Conservation, reviews the success rates associated with these moves from a species-conservation standpoint.

Let's be honest, review articles are popular because they are easier than studies. Studies can take months or years and require methodology, money and expertise. A review just means finding other papers and figuring out what the consensus is.

Want to prove acupuncture works and that organic food is superior? Do a review. And if you really want to promote an ideology, do an unweighted random-effects meta-analysis and make sure to include some outlier results.