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Humans each have 23 pairs of chromosomes, the 23rd of which determines sex. Females carry two X sex chromosomes, males carry one X and one Y chromosome. Yet this male chromosome carries genes that females lack and those male genes are expressed in all cells of the body, but their only confirmed role has been limited determining male or female.

Yaws is a childhood disease causing highly infectious skin lesions. It is spread by touch and, in advanced cases, can leave sufferers with severe bone disfigurement. While it is easily curable in its early stages today, and is almost eradicated, the bone disfigurements are irreversible. Yet 4,000 years ago there was no treatment and a new study looked at skeletal remains from the Man Bac archaeological site,  excavated in 2005 and 2007, in the Ninh Bình Province of Vietnam. After seeing what might be yaws on a photograph of Man Bac remains, a team of experts confirmed it - and University of Otago graduate student Melandri Vlok found a second example of the disease. 

A new study shows there is even more reason to worry about the Zika and chikungunya viruses and the pests that spread them; increased risk of neurological diseases like stroke.

A new mathematical model seeks to predict economic performance of crops, which will allow breeders to obtain the plants with the highest possible quality. Using even the most advanced legacy tools, it is very difficult to create a new variety of plants and it usually takes 10-12 years. Using genomic selection models, this process can be accelerated several times, finds the new study, using a new mathematical model for predicting crop phenotypic traits as a function genotype.

Numerous criticisms of medical science have been articulated in recent years. Some critics argue that spurious disease categories are being invented, and existing disease categories expanded, for the aim of profit. Others say that the benefits of most new drugs are minimal and typically exaggerated by clinical research, and that the harms of these drugs are extensive and typically underestimated by clinical research.

In the old days, if you wanted to spread desirable characteristics in livestock you had to try breeding and hope for the best. The 19th century breakthroughs in genetics promised a future where trial and error was no longer the norm.Now, with desire to optimize food production and reduce environmental impact without harming choices for poor people, scientists have created pigs, goats and cattle that can serve as viable “surrogate sires” - male animals that produce sperm carrying only the genetic traits of donor animals.

We're living longer than ever, but that means we now have to think about new issues that were uncommon when life expectancy was low. Muscles shrink and their strength dwindles as we age. When that is excessive, the condition is called sarcopenia, and it affects every third person over the age of 80, reducing mobility, autonomy and quality of life.There may be hope in the form of a well-known drug, Rapamycin, that can delay the progression of age-related muscle weakness.

A brain-controlled prosthetic limb have shown that machine learning techniques helped an individual with paralysis learn to control motion using their brain activity without requiring extensive daily retraining. It is proof-of-concept for how future models can overcome limitations of prior brain-computer interface efforts, which existing had to be reset and recalibrated each day, almost like asking someone to learn to ride a bike over and over again each day.

Children learn languages much easier than adults, and also seem to recover from neural injuries better. The reason may be that adults process most discrete neural tasks in specific areas in one or the other of their brain's two hemispheres, while kids use both the right and left hemispheres to do the same task.

If you are a tourist and visit California in the United States or Bavaria in Germany, you will quickly notice it is not like a lot of other places in those countries. A cultural mentality exists and people who identify with the stereotype are more likely to stay or even move there.A new paper finds that people who live in mountain regions of the U.S. maintain more of that sensibility even in the modern era. Historian Frederick Jackson Turner, a Harvard academic, presented his thesis on the US frontier in 1893, describing the "coarseness and strength combined with acuteness and acquisitiveness" it had forged in the American character.

You can't market a "Tennessee whiskey" unless it goes through charcoal filtration called the Lincoln County Process, named such after the locale of the original Jack Daniel's distillery. Charcoal is not exclusive to American blended whiskey, this type of filtration is a common step in the production of distilled beverages, including vodka and rum, but while "charcoal mellowing" in Tennesse Whiskey varies from manufacturer to manufacturer, they all involve passing the fresh whiskey distillate through a bed of charcoal, usually derived from burnt sugar maple, prior to barrel-aging the product.

When you think of shrimp, lobster, or crabs, you don't think of the hottest place on Earth, but a new freshwater Crustacea has been discovered during an expedition of the desert Lut, which is the record-holder for temperature on land. The Lut desert, Dasht-e Lut in Farsi, is the second largest desert in Iran. Almost deprived of vegetation, the Lut desert harbors a diverse animal life, but no permanent aquatic biotops, such as ponds. Instead, after rain falls, non-permanent astatic water bodies are filled including the Rud-e-Shur river from north-western Lut. And that is when these new creatures can be more readily found.