Issues
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Cover Image
Cover Image
cover: Last austral summer, researchers stayed in this field camp near Allan Hills, Antarctica, where they had found bits of multimillion-year-old ice. International teams also aim to drill continuous cores that peer further back in time than ever before; air trapped in old ice provides a unique archive of the ancient atmosphere. In other Antarctic research, scientists are probing Thwaites Glacier with an instrument that swims below it. See
page 18 for more on the search for the oldest ice andpage 16 for surprises about glacial melting. (Courtesy of Julia Marks Peterson.)
Readers' Forum
Physics and poetry revisited
The clean-energy challenge
Correction
Readers’ Forum
Search and Discovery
Actin assembly is a physics problem
Simple mechanical forces may be key to understanding an essential biological process: the formation of cytoskeletal components that give structure to every cell in your body.
Melting underneath Thwaites Glacier is more complicated than expected
A robot exploring beneath the vulnerable Antarctic glacier has found new features that affect its melt rate.
Issues and Events
Scientists drill for oldest ice to reveal secrets about Earth’s climate
Nations collaborate—and compete—to access million-plus-year-old ice in Antarctica.
Despite unknowns, NNSA plunges ahead on plutonium pits
The National Nuclear Security Administration has delayed by several years the date by which it will comply with a congressional mandate to build 80 pits per year.
Articles
The complexities of the human placenta
The flow and transport of solute molecules in the intricate structure of the placenta make the organ a fetal life-support system.
Unveiling the mystery of solar-coronal heating
Miniature flares recently discovered by probes that have approached the Sun’s surface are helping physicists understand how the Sun’s corona reaches temperatures of millions of kelvin.
Physicists as reparations?
In addition to recruiting more well-known rocket scientists, the US government brought from Europe thousands of other scientists who helped to advance numerous research fields during the Cold War.
Books
Something rotten in the state of Denmark
The Copenhagen Network: The Birth of Quantum Mechanics from a Postdoctoral Perspective, Alexei Kojevnikov, Springer, 2020, $69.99 (paper)
More machine than human?
The End of Astronauts: Why Robots Are the Future of Exploration, Donald Goldsmith and Martin Rees, Harvard U. Press, 2022, $25.95
New Products
Obituaries
Peter Hale Molnar
Roy Frederick Schwitters
Quick Study
Synthetic dimensions
Novel geometries can be created using microwaves to couple the internal states of atoms or molecules and mimic movement in real space.