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Front Matter

Sixty-six million years ago, an asteroid wiped out a huge swath of life on planet Earth. But could this and similar impacts have helped kick-start life itself? Image courtesy of Detlev van Ravenswaay/ScienceSource.
News Feature: Life after the asteroid apocalypse
Sixty-six million years ago, an asteroid wiped out a huge swath of life on planet Earth. But could this and similar impacts have helped kick-start life itself?
Image courtesy of Detlev van Ravenswaay/ScienceSource.
Twisted light is being used to build optical tweezers and ultra-powerful microscopes, and it could eventually be used in microscale machinery and for novel spectroscopic analyses. But optical communications is likely to be its most important application.
Core Concept: “Twisted” light beams promise an optical revolution
Twisted light is being used to build optical tweezers and ultra-powerful microscopes, and it could eventually be used in microscale machinery and for novel spectroscopic analyses. But optical communications is likely to be its most important application.
Image courtesy of Mario Krenn (University of Vienna, Vienna).
In the midst of a microscopy boom, stem cell researchers are coming up with inventive techniques for capturing live images of these enigmatic cells in their native habitats. Image courtesy of Panteleimon Rompolas (University of Pennsylvania, Philadelphia).
Inner Workings: Microscopy lights up stem cells in action
In the midst of a microscopy boom, stem cell researchers are coming up with inventive techniques for capturing live images of these enigmatic cells in their native habitats.
Image courtesy of Panteleimon Rompolas (University of Pennsylvania, Philadelphia).
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Archaeological excavations in Denmark shed fresh light on a fierce battle in Northern Europe in the first century AD. Cut marks on bones and hip bones threaded on a stick hint at the possibility of ritual in the disposal of human remains, according to the authors.
Archaeological finds illuminate Roman Empire battle
Archaeological excavations in Denmark shed fresh light on a fierce battle in Northern Europe in the first century AD. Cut marks on bones and hip bones threaded on a stick hint at the possibility of ritual in the disposal of human remains, according to the authors.
Researchers report links between records of lead pollution in Greenland ice cores and economic fluctuation in ancient societies. The record of European lead pollution in Greenland ice provides insights into ancient economic activities, including lead and silver mining.
Lead pollution in Greenland ice tracks historical events
Researchers report links between records of lead pollution in Greenland ice cores and economic fluctuation in ancient societies. The record of European lead pollution in Greenland ice provides insights into ancient economic activities, including lead and silver mining.
Researchers report a census of biomass on Earth, and comparison of the census with historical biomass estimates suggests that human activities have led to reductions in wild mammal, fish, and plant biomass, according to the authors.
Global biomass distribution
Researchers report a census of biomass on Earth, and comparison of the census with historical biomass estimates suggests that human activities have led to reductions in wild mammal, fish, and plant biomass, according to the authors.
Image courtesy of Pixabay/bildgebende_Momente.
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David Hughes discusses how a parasitic fungus manipulates ant behavior for reproduction.
Manipulation of ant behavior by parasites
David Hughes discusses how a parasitic fungus manipulates ant behavior for reproduction.
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PNAS QnAs with NAS Foreign Associate Caroline Dean, winner of the 2018 L’Oreal For Women in Science Award.
PNAS QnAs
PNAS QnAs with NAS Foreign Associate Caroline Dean, winner of the 2018 L’Oreal For Women in Science Award.

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