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Front Matter
A group of evolutionary biologists sees evidence for a hologenome. Others dismiss it
entirely. One thing’s certain: The debate remains heated.
Image credit: Shutterstock/Piriya Gutsch.
While horizontal gene transfer has been well documented among bacteria, recent work suggests gene transfers from bacteria to multicellular organisms are much more common than previously thought.
Image credit: Richard Cordaux.
In the News
Chemical evidence suggests ritual use of psychoactive plants used to brew ayahuasca in pre-Columbian Bolivia.
Image courtesy of Juan Albarracin-Jordan and José M. Capriles.
Researchers present evidence of Neolithic kinship and violence based on remains from a mass grave in Poland.
Image courtesy of Piotr Włodarczak.
Volume of cosmonauts’ brain ventricles increased by an average of 12% after spaceflight—a potential mechanism to cope with increased brain fluid volume, a study suggests.
Image courtesy of R. Maxine Rühl.
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Daniel Hodgson explains the physics of chocolate-making.
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PNAS Profile of NAS member and cell biologist Junying Yuan
Image courtesy of Aaron Washington for Harvard Medical School.
