Men with gender dysphoria, commonly called gender identity disorder, are born as males but behave as and identify with women and want to change sex.

Around puberty, the testes of men start to produce androstadienone, a musky-smelling steroid produced by men
as a breakdown product of testosterone. Men release it in their sweat, especially from the armpits. Its only known function is to work like a pheromone; when women smell androstadienone, their mood tends to improve, their blood pressure, heart rate, and breathing go up, and they may become aroused. 
 

Evidence for massive and abrupt iceberg calving in Antarctica dating back 19,000 to 9,000 years ago is based on an analysis of new, long deep sea sediment cores extracted from the region between the Falkland Islands and the Antarctic Peninsula. 

The study in Nature documents that the Antarctic ice sheet is unstable and can abruptly reorganize Southern Hemisphere climate and cause rapid global sea level rise. 

Why are some 75-year-olds downright spry while others can barely get around?  Some people who smoke look old from a young age while others don't.

Part of the explanation, say researchers writing in Trends in Molecular Medicine is differences from one person to the next in exposure to harmful substances in the environment. 

A birth date is a chronological age but it might mean little in terms of the biological age of our body and cells. The researchers say that what we need now is a better understanding of the chemicals involved in aging and biomarkers to measure their effects.

A mechanism that enables the development of resistance to Acute Myeloid Leukemia (AML) anticancer drugs, thereby leading to relapse, has been identified by Kathy Borden of the University of Montreal's Institute for Research in Immunology and Cancer (IRIC) and her collaborators. Kathy Borden is a Principal Investigator at IRIC and a professor at the university's Department of Pathology and Cell Biology. The development of drug resistance is one of the main problems in clinical oncology and the cause of relapse in many patients.

NEW YORK, NY (May 21, 2014) — The overall number and nature of mutations—rather than the presence of any single mutation—influences an individual's risk of developing schizophrenia, as well as its severity, according to a discovery by Columbia University Medical Center researchers published in the latest issue of Neuron. The findings could have important implications for the early detection and treatment of schizophrenia.

Tai Chi is a traditional Chinese pastime that had its origins in self-defense. Like with many sports and hobbies, its benefits in relaxation and fitness are well-documented.

A new paper in Cell Transplantation adds to its benefits, finding in a small study that it increased a cluster of differentiation 34 expressing (CD34+) cells, a stem cell important to a number of the body's functions and structures.

Three groups of young people were tested to discover the benefits of Tai Chi, brisk walking or no exercise.