Researchers have used human induced pluripotent stem cells (iPSCs) to generate new hair, the first step toward the development of a cell-based treatment for people with hair loss. 

In the United States alone, more than 40 million men and 21 million women are affected by hair loss. The research team developed a protocol that induced human pluripotent stem cells to become dermal papilla cells. They are a unique population of cells that regulate hair-follicle formation and growth cycle. 

Human dermal papilla cells on their own are not suitable for hair transplants because they cannot be obtained in necessary amounts and rapidly lose their ability to induce hair-follicle formation in culture. 

New studies have found that a supplement of ghrelin - the "appetite hormone" - increased the sexual activity of mice.

Ghrelin is a gastrointestinal hormone that is released from the stomach, and is involved in the stimulation of our appetite by activating the brain's reward system. Since the brain's reward system also motivates us to seek a partner and to have sex, a group of researchers at the Sahlgrenska Academy decided to investigate whether ghrelin may also affect sexual behaviors. 

The answer is: yes, at least in mice.

In the largest study of opioids users done to-date, scholars analyzed records of 198,247 people in England who had been involved in drug treatment or the criminal justice system between 2005 and 2009. 

They found that opioid users were six times more likely to die prematurely than people in the general population. Almost one in ten of these deaths were due to suicide, more than four times the rate in the general population. The data recorded 3,974 deaths and their causes during this period. The study is the first to record age trends in opioid users' mortality and with age, the gap gets even wider. In the oldest 45-64 age-group, homicide was 27 times more common than in the general population. 

Multiculturalism was once a good thing - people learned about the world outside their own neighborhoods - but it has become bad. Instead of being a positive, multiculturalism is often invoked by people with an agenda; people who want to promote division among their constituents note that the majority will homogenize their beliefs while people against immigration complain about pockets of foreign nationals with unknown motivations inside their cities.

A lot of cultural angst and even more money is tied up in the notion that girls are somehow being left behind and more awareness of the issue, along with programs against sexism, have become common, even at the graduate levels of universities. But the origin of that belief in the last two decades has been a mystery. There are some differences, areas where girls achieved less than boys, and vice-versa. No Child Left Behind was a successful reform of education that led to girls achieving parity with boys in the only area they lagged, mathematics, and a new analysis finds that the concern may have been misplaced all along, individual variance aside.

Your closest friends are advocates and see the best in you, but they are also observers of the personality traits that could send you to an early grave, according to a new paper.

The authors say that that your personality at an early age (20s) can predict how long you will live past 75 years - and that close friends are usually better than you at recognizing these traits. 

Male participants seen by their friends as more open and conscientious ended up living longer. Female participants whose friends rated them as high on emotional stability and agreeableness also enjoyed longer lifespans, the study in Psychological Science found.