Influenza has a long history of being one of the most deadly diseases to afflict humanity, but what exactly makes it so dangerous?

Certainly one reason is that influenza viruses have a history of jumping from other animals to humans, which, when the trans-species virus is new to the human population, generally means that human immune systems have no natural resistance. Another reason is that influenza viruses, with their rapidly mutating single-strand RNA genomes, are highly variable over time.

Surgeons and transplant centers nationwide increasingly have rejected hearts donated for transplantation despite a growing need for them, according to a new study which also found that the rejection of "marginal" donor hearts - those with undesirable qualities, such as being small or coming from an older donor - varied significantly across geographical regions.

In other words, some hearts rejected in one region would be accepted in another.

A psychedelic drug, (R)-DOI, prevents the development of allergic asthma in a mouse model. The effects are potent and effective at a concentration 50-100 times less than would influence behavior.

In Manot, a karstic cave in the North of Israel close to the Lebanese border, excavations that began in 2010 have documented the peopling of the cave for over 100,000 years.

Around 30,000 years ago, the roof of the cave collapsed and sealed the archaeological layers until the 21st century. Beside stone tools and animal bones, some few human remains were preserved. The most spectacular finding was made on an elevated shelf within a small chamber of the cave: a very well preserved "calotte", the upper part of a braincase.

The facial bones which contain a lot of diagnostic traits were missing.

Amid the growing debate about the high price of powerful new drugs in the United States, a recent analysis suggests that breakthrough therapies for blood cancers may, in many cases and with some important caveats, provide reasonable value for money spent. Researchers present this viewpoint, based upon a comprehensive analysis of published cost-effectiveness ratios, online today in Blood, the Journal of the American Society of Hematology (ASH). The manuscript is being published as a Blood Forum article, a feature of the journal designed to present well-documented opinions on controversial topics and provide a sounding board for issues of importance to the science and practice of hematology.

A collaborative study led by scientists from the Mechanobiology Institute (MBI) at the National University of Singapore (NUS) has revealed the mechanical forces that drive epithelial wound healing in the absence of cell supporting environment. This research was published in Nature Communications in January 2015.

Skin not only provides an essential protective barrier against foreign materials and pathogens, but it also helps the body retain various fluids and electrolytes. When this barrier is damaged, the consequences can be devastating. Ulcers, bleeding and bacterial infections may result and the chances of these occurring increases the longer wounds remain open.