This finding documents smoke-dried mummification of the dead, mostly in tightly bound crouched postures, from archaeological ...

The editors note that the PNAS Editorial and Journal Policies stipulate that authors must provide sufficient information to establish the identity of a new compound and its purity, must include ...

In the accompanying comment, Ju et al. (1) supports the deeper soil organic carbon (SOC) loss from our continental-scale soil resampling study (2). Importantly, we greatly appreciate their novel ...

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In March 1835, a young Charles Darwin was high up in the Andes and struggling to cook supper. “Our potatoes after remaining for some considerable time in the boiling water were nearly as hard as ever, ...

Edited by Mariana F. Wolfner, Cornell University, Ithaca, NY, and approved July 16, 2021 (received for review May 24, 2021) ...

Animal models and human studies suggest that forever chemicals, delivered through water, food, and air, alter the immune system, potentially diminishing our ability to fight disease or respond to a ...

The coronavirus disease 2019 (COVID-19) pandemic, caused by the novel coronavirus severe acute respiratory syndrome coronavirus 2 (SARS-CoV-2), has already claimed more than 470,000 deaths worldwide ...

The use of heterologous systems to express spider silk has become an attractive method. However, achieving cost-effective production and high yields is still challenging. Here, we describe the ...

Wildfires are a major source of fine particulate matter (diameter <2.5 µm; PM 2.5), which is a health hazard. Since the mid-1980s, the total US area burned by wildfires has been increasing, with fires ...

Edited by John H. Seinfeld, California Institute of Technology, Pasadena, CA, and approved March 30, 2018 (received for review January 22, 2018) ...

Evolving the human nicheBoivin et al.’s (1) article profoundly deepens scientific understanding of anthropogenic global ecological change from Pleistocene to present by offering robust new evidence of ...