How Many Nuclear Weapons Exist, and Who Has Them?

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March 22, 2022

Defense How Many Nuclear Weapons Exist, and Who Has Them? Nuclear states admit to owning about 13,000 warheads, but the real number could be higher By Joe Phelan,LiveScience

Astronomy Cosmic Collisions Yield Clues about Exoplanet Formation Low levels of bombardment reveal that the TRAPPIST-1 system probably grew quickly By Sean Raymond

Climate Change Proposed SEC Climate Rules Have Sparked a Fight over Indirect Emissions If finalized, the rules would require companies to disclose emissions associated with their consumers and suppliers By Avery Ellfeldt,E&E News

Particle Physics Why Some Fluids Flow Slower when Pushed Harder A transparent rock experiment shows how stretchy molecules kick up eddies By Rachel Berkowitz

Physiology A Natural Disaster Made Monkeys Age Faster A large colony may provide clues about the biology of traumatic stress resulting from climate change and war By Ingrid Wickelgren

Politics How the Pandemic Remade Science Journalism It's no longer possible to separate science and politics By Tanya Lewis

Vaccines Vaccines Remain Effective against BA.2, but Protection from Infection Wanes over Time Such protection declines within months of the mRNA COVID vaccines' third dose. Yet the vaccines continue to ward off severe disease By Saima May Sidik,Nature magazine

Defense Where Is Russia's Cyberwar? Researchers Decipher Its Strategy When Russia invaded Ukraine, many analysts expected an unprecedented level of cyberattacks—which so far haven't materialized By Elizabeth Gibney,Nature magazine

Mathematics The Evolving Quest for a Grand Unified Theory of Mathematics More than 50 years after the seeds of a vast collection of mathematical ideas called the Langlands program began to sprout, surprising new findings are emerging By Rachel Crowell

Reproduction What Quantum Mechanics Can Teach Us about Abortion As light can exist as both a particle and a wave, an abortion provider can honor birth and fight for a person's right to give birth when it's right for them By Cara C. Heuser

Policy COVID Changed the World of Work Forever People realized their jobs don't have to be that way By Christina Maslach,Michael P. Leiter

FROM THE STORE Scientific American Health & Medicine, Volume 4, Issue 2

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FROM THE ARCHIVE No One Should Have Sole Authority to Launch a Nuclear Attack Leaving the decision to strike to the president alone is dangerous By THE EDITORS | August 2017

QUOTE OF THE DAY "We know which countries have nuclear weapons, but we don't necessarily know how many nuclear weapons they have; Israel, for instance, does not publicly acknowledge its program." Anne Harrington, senior lecturer in international relations at Cardiff University

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