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Front Matter
Chemists are tinkering with a variety of different designs and means of propulsion, though practical uses for these mini-motors have yet to be realized.
Illustration courtesy of Jo Richers (artist) and David Leigh (University of Manchester, Manchester, United Kingdom).
The videos, shown with minimal information and often without sound or music, are meant to provide a sort of scientific cinéma vérité.
Image courtesy of Nipam Patel (University of California, Berkeley, CA).
In the News
Researchers report an early monumental burial site near Lake Turkana in Kenya that may have served as a stable landmark for mobile herders in a changing physical environment and as a social anchor point to foster communal identity and interaction among mobile herders.
A study reports evidence of water ice on the moon’s surface, discerned via a signature in the near-infrared reflectance spectra that suggests the ice was formed by slow condensation due to impact or water migration through the lunar exosphere.
Image courtesy of Pixabay/Ponciano.
A study explores the cognitive effects of reducing fine particulate matter levels in air in China to the US Environmental Protection Agency standard, and concludes that the economic cost of air pollution could be greater than previously thought.
Image courtesy of Pixabay/SD-Pictures.
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Science Sessions Podcasts
Victoria Orphan and Elizabeth Trembath-Reichert discuss microbial life in the deep subseafloor.
Featured Profile
PNAS Profile with NAS member and anthropologist Michael Tomasello
