Front Matter

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• News Feature: Skimming the surface of underwater landslides
  Scientists are just beginning to understand these subaquatic phenomena capable of producing large tsunamis and wreaking havoc on offshore facilities. Image courtesy of Christian Berndt (GEOMAR).

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• Opinion: Why protect nature? Rethinking values and the environment
  We should not only value the environment in terms of intrinsic and instrumental values, but in terms of relational values as well. Otherwise we risk omitting important ways in which people relate to nature and to each other. Image courtesy of Henri-Paul Coulon (photographer).

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• Inner Workings: Building accelerator afterburners with plasma
  Huge planned particle accelerators are pushing the limits of economic and political feasibility. An experimental approach could serve as an energy booster of sorts for a linear collider, allowing for much higher energies in the same distance. Image courtesy of Weiming An (University of California, Los Angeles, CA).

PNAS in the News

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• Overlap of shark and fishing vessel ranges
  Researchers report significant geographic overlap between shark and fishing activity.
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• Competition and extinction of Neanderthals
  A study suggests how Neanderthals could have been driven to extinction by competition with modern humans.
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• Microplastics and Pacific oyster reproductive cycle
  Pollutants known as microplastics may endanger the Pacific oyster and other marine bivalves, according to a study.
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