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Catch up on coronavirus stories and special reports, curated by Mike Allen everyday

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Jean Lachat / University of Chicago

Neutrinos are some of the most common particles in the universe, but they're also some of the most mysterious. They have (almost) no mass and no charge, and can pass through solid objects (and entire planets) like we pass through air. But scientists at Duke University have successfully detected these 'ghost particles' doing something no one has seen before: scattering off the nucleus of an atom.

Why it matters: Currently, scientists study neutrinos by measuring the energy produced when they interact with a proton or neutron — a very rare event. Now that scientists know they can detect neutrinos scattering off a nucleus, they might be able to use them to detect supernovas, or use a similar technique to detect dark matter scattering off of nuclei, reports Science News.

Physicists say understanding neutrinos is crucial to our understanding of the universe. They're produced by nuclear fusion and radioactive decay. Some scientists think neutrinos might be a part of why the universe is made up of matter and not antimatter.

Not quite a game changer: Forty years ago, researchers hypothesized that neutrinos would scatter a certain way if they interacted with a nucleus, according to the standard model of physics. In this experiment, the neutrino scattered exactly as predicted (and the standard model is safe... for now.)

Handheld physics lab: Not only are neutrinos really, really hard to observe, most of the equipment currently used to detect them is really, really big and expensive. For example, the proposed India-based Neutrino Observatory requires a 50,000 ton calorimeter. But the researchers in this experiment used a detector about the same size as a champagne bottle.

Go deeper

Updated 2 hours ago - World

Mexican President López Obrador tests positive for coronavirus

Mexico's President Andrés Manuel López Obrador during a press conference at National Palace in Mexico City, Mexico, on Wednesday. Photo: Ismael Rosas/Eyepix Group/Barcroft Media via Getty Images

Mexican President Andrés Manuel López Obrador announced Sunday evening that he's tested positive for COVID-19.

Driving the news: López Obrador tweeted that he has mild symptoms and is receiving medical treatment. "As always, I am optimistic," he added. "We will all move forward."

2 hours ago - Politics & Policy

Sarah Huckabee Sanders to run for governor of Arkansas

Sarah Huckabee Sanders at FOX News' studios in New York City in 2019. Photo: Steven Ferdman/Getty Images

Former White House press secretary Sarah Huckabee Sanders will announce Monday that she's running for governor of Arkansas.

The big picture: Sanders was touted as a contender after it was announced she was leaving the Trump administration in June 2019. Then-President Trump tweeted he hoped she would run for governor, adding "she would be fantastic." Sanders is "seen as leader in the polls" in the Republican state, notes the Washington Post's Josh Dawsey, who first reported the news.

Coronavirus has inflamed global inequality

Illustration: Aïda Amer/Axios

History will likely remember the pandemic as the "first time since records began that inequality rose in virtually every country on earth at the same time." That's the verdict from Oxfam's inequality report covering the year 2020 — a terrible year that hit the poorest, hardest across the planet.

Why it matters: The world's poorest were already in a race against time, facing down an existential risk in the form of global climate change. The coronavirus pandemic could set global poverty reduction back as much as a full decade, according to the World Bank.

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