Caleb Scharf

Writing for PS since 2014
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Caleb Scharf is Director of Astrobiology at Columbia University. His next book, The Copernicus Complex, will be published in September 2014.

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Our Cosmic Context

NASA/ESA/Hubble

May 5, 2014 Caleb Scharf explains how investigations into life on other planets help us to understand Earth's challenges.

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Drew Angerer/Getty Images

The World Economy Goes Hollywood

Jan 18, 2019 Anatole Kaletsky suggests that, instead of being predictive, investor behavior has become increasingly reactive.

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Afghanistan’s Forgotten Half

Jan 18, 2019 Anne-Marie Slaughter & Ashley Jackson say that any peace agreement with the Taliban that does not include women's rights is unlikely to hold.

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A Three-State Solution for Israel and Palestine?

Jan 18, 2019 Shlomo Ben-Ami says that the goal of two states for two peoples no longer corresponds to facts on the ground.

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The End of Postwar Germany

Jan 18, 2019 Helmut K. Anheier reviews four recent books about the country’s identity crisis in the face of profound geopolitical change.

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America Must Face Reality on China

Jan 17, 2019 P.H. Yu explains why the two countries' economic rivalry and political disagreements need not lead to catastrophe.

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Omar Marques/SOPA Images/LightRocket via Getty Images

A Murder in Gdańsk

Jan 17, 2019 Sławomir Sierakowski sees in the public murder of the city's mayor the predictable result of the ruling party's political tactics.

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Saving Children from Having Children

Jan 17, 2019 Patricee Douglas offers a blueprint to improve young girls' access to sexual and reproductive-health services.

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Korea’s Year of Living Diplomatically

Jan 17, 2019 Yoon Young-kwan reflects on the peninsula’s progress toward denuclearization in 2018, and the work that remains to be done.

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