E.P.A. to Announce Phase-Down of Powerful Greenhouse Gases
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E.P.A. to Announce Phase-Down of Powerful Greenhouse Gases

WASHINGTON — The Environmental Protection Agency on Monday will take its first significant step to curb climate change, an agency spokesman confirmed, moving to phase down chemicals used in refrigeration and air-conditioning that are thousands of times more potent than carbon dioxide at warming the planet. The proposed regulation aims to reduce the production and…

Horse Fossil, Possibly From the Ice Age, Is Found in Las Vegas Backyard
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Horse Fossil, Possibly From the Ice Age, Is Found in Las Vegas Backyard

While digging in Matthew Perkins’s backyard last week in Las Vegas to build a pool, construction workers made an unexpected discovery: bones buried about five feet deep in the soil. When the foreman arrived a few days later, he came with officers and crime scene investigators from the Las Vegas Metropolitan Police Department. They determined…

Psychiatry Confronts Its Racist Past, and Tries to Make Amends
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Psychiatry Confronts Its Racist Past, and Tries to Make Amends

Dr. Benjamin Rush, the 18th-century doctor who is often called the “father” of American psychiatry, held the racist belief that Black skin was the result of a mild form of leprosy. He called the condition “negritude.” His onetime apprentice, Dr. Samuel Cartwright, spread the falsehood throughout the antebellum South that enslaved people who experienced an…

The Last Creature You’d Expect Left Mysterious Trails on the Ocean Floor
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The Last Creature You’d Expect Left Mysterious Trails on the Ocean Floor

Deep-sea sponges are not known for their mobility. After all, they lack muscles, nervous systems and organs. And forget about fins or feet for traveling the Arctic seafloor. But new research suggests these ancient life-forms can and do, indeed, get around — and far more than marine biologists believed. By studying hundreds of photos and…

A 22-Million-Year Journey From the Asteroid Belt to Botswana
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A 22-Million-Year Journey From the Asteroid Belt to Botswana

This was a surreal place to go meteorite hunting. Bat-eared foxes and warthogs strolled past, lions stealthily stalked and slaughtered giraffes while leopards lounged in trees. Wardens from Botswana’s Department of Wildlife and National Parks protected the search party in case a fanged predator got too close for comfort. The meteorites also looked a lot…

She Bought a Truck on eBay, Then Forgot It. A Dementia Diagnosis Came Later.
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She Bought a Truck on eBay, Then Forgot It. A Dementia Diagnosis Came Later.

“We went into the study thinking we might be able to see these financial indicators,” said Lauren Hersch Nicholas, a co-author of the study who is an associate professor of public health at the University of Colorado. “But we were sort of surprised and dismayed to find that you really could. That means it’s sufficiently…