While expanding a reservoir in Snowmass Village, Colorado, construction workers stumbled upon a big bone. And then another, and another, and another. 

Killer whales eat 375 pounds of food per day. Now imagine most of that is salmon, the food source they most often in the summer, and you can imagine how devastating that can be to the salmon population of the Pacific Northwest if such whales were higher population. That's equivalent salmon each day to what 200 Americans for a year (<300,000 metric tons per year total consumption.)

Salmon is currently the third most popular fish in the United States (behind shrimp and tuna) and one third of it comes from Pacific salmon, both farmed and in the wild. 

The determination about diets was made using an analysis of fish DNA in killer whale poop.

A new Cochrane Review published today shows that targeting exercises to muscles that support and control the spine offers another strategy to reduce pain and disability caused by lower back pain.

Lower back pain is one of the most common health conditions worldwide. It can have substantial health and economic costs as people experience disability and general ill health, leading them to need time off work.

It may not be sexism that keeps more women from top jobs, it may be less understanding of the role of social capital in reaching the top, according to graduate student Natasha Abajian of City University London at the British Psychological Society's Division of Occupational Psychology annual conference in Nottingham.

In industrialized countries, a particularly high number of people suffer from arteriosclerosis -- with fatal consequences: Deposits in the arteries lead to strokes and heart attacks. A team of researchers under the leadership of the University of Bonn has now developed a method for guiding replacement cells to diseased vascular segments using nanoparticles. The scientists demonstrated in mice that the fresh cells actually exert their curative effect in these segments. However, much research remains to be done prior to use in humans. The results are now being published in the renowned journal ACS NANO.

New research finds that bile acids which are altered by bacteria normally living in the large intestine inhibit the growth of Clostridium difficile, or C. diff. C. diff is a harmful bacterium that can cause painful and sometimes fatal infections.

President Barack Obama has used an executive order to bypass Congress and tighten control and enforcement over firearms in the United States, in response to concerns about gun violence and gun safety.

If it survives the inevitable court challenges, it will mean more background checks, expanded registration and $500 million for mental health initiatives. President Obama believes these measures will keep firearms from criminals - and they should - but he also claims that it will reduce suicides. That is not so simple to believe. As is well-known, 60 percent of deaths due to firearms are suicides and the lack of gun ownership in Japan did not prevent any of those, they simply use rope.

Urban elites tend to think being fat and dumb is a rural problem but studies show just the opposite; that is why so many health planners want to add more parks and places for people to walk, it emulates country life more.

Genetics are somewhat important, it impacts how many calories someone can eat given their metabolism, but social environment is a big factor. Since agricultural science has made it possible for poor people be fat, that is exactly what has happened, and not just in America. Obesity has risen dramatically in Europe as well. 

Scientists from the Mechanobiology Institute, Singapore (MBI) at the National University of Singapore have discovered the universal building blocks that cells use to form initial connections with the surrounding environment. These early adhesions have a consistent size of 100 nanometres, are made up of a cluster of around 50 integrin proteins and are the same even when the surrounding surface is hard or soft. Deciphering the universal nature of adhesion formation may reveal how tumour cells sense and migrate on surfaces of different rigidity, which is a hallmark of metastasis, the devastating ability of cancer to spread throughout the body. This study was published in the 7 December 2015 issue of Developmental Cell.

Building blocks for cell adhesion

Even before they can read, children as young as 3 years of age are beginning to understand how a written word is different than a simple drawing -- a nuance that could provide an important early indicator for children who may need extra help with reading lessons, suggests new research from Washington University in St. Louis.

"Our results show that children have some knowledge about the fundamental properties of writing from a surprisingly early age," said study co-author Rebecca Treiman, PhD, the Burke & Elizabeth High Baker Professor of Child Developmental Psychology in Arts & Sciences.