Scientists have uncovered the first direct evidence that ancient Americans relied primarily on mammoth and other large animals for food. Their research sheds new light on both the rapid expansion of humans throughout the Americas and the extinction of large ice age mammals. Scientists have uncovered the first direct evidence that ancient Americans relied primarily

A new study sheds light on how long humans in the Americas have had relationships with the ancestors of today's dogs -- and asks an 'existential question': What is a dog? "Dog is man's best friend" may be an ancient cliché, but when that friendship began is a longstanding question among scientists. A new study

New research identifies an association between glyphosate exposure in mice and symptoms of neuroinflammation, as well as accelerated Alzheimer's disease-like pathology. This study tracks both the presence and impact of glyphosate's byproducts in the brain long after exposure ends, showing an array of persistent, damaging effects on brain health. The findings suggest the brain may

A diet high in ultra-processed foods is associated with higher amounts of fat stored inside thigh muscles, regardless of the amount of calories consumed or level of physical activity, according to a new study. Higher amounts of intramuscular fat in the thigh could also increase the risk for knee osteoarthritis. A diet high in ultra-processed

Previous research found that insects can ingest and absorb pure, unrefined microplastics -- but only under unrealistic, food-scarce situations. Zoologists have now tested mealworms in a more realistic scenario, feeding them ground-up face masks -- a common plastic product -- mixed with bran, a tastier option. After 30 days, the research team found the mealworms

A research group has discovered that in mammals, a protein kinase A (PKA) promotes wakefulness, while protein phosphatase 1 (PP1) and calcineurin promote sleep. This study revealed that the balance between sleep and wakefulness is regulated by the action of multiple enzymes, which is an important finding when considering how to control sleep duration and

A study of American and Canadian universities found most are including climate change in the curriculum for future urban planners, but they vary widely in their approaches to preparing the future professionals for mitigating, adapting to and being resilient to climate change in their profession. Urban and community planners have a vital role in preparing

Researchers found that emissions from streams are largely derived from nitrification processes in agricultural soils. Further, they found that stream emissions make up a much greater portion of the annual nitrous oxide budget than previously known. In the upper reaches of a Minnesota watershed, the water is so full of dissolved nitrous oxide that University