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Unusual Origin Found for Asteroid That Killed the Dinosaurs

A study adds strong evidence to the hypothesis that the deadly rock came from a family of objects that originally formed well beyond the orbit of the planet Jupiter.
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Beware the Toxic and Explosive Blue Backpack This Termite Carries

Scientists studied the unusual chemical reaction used by a species of the insect in an act of self-sacrifice to save nests from invaders.
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Russia Sentences U.S. Citizen to 12 Years in Prison on Treason Charges

Ksenia Karelina is accused of donating $52 to a New York-based nonprofit that sends assistance to Ukraine.
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Ukraine’s Incursion Into Russia Flips the Script on Putin

The reality of 130,000 displaced Russians and a chaotic official response may begin to puncture the official line that Russia is steadily heading toward victory.
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Ukraine Is Poking the Russian Bear

Its cross-border attack shows “the war is not over.”
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San Francisco Moves to Lead Fight Against Deepfake Nudes

City Attorney David Chiu has filed a lawsuit seeking to permanently shutter 16 popular websites that turn images of real girls and women into pornography.
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How Ukrainian Troops Invaded Russia

Planned in secrecy, the incursion was a bold move to upend the war’s dynamics and put Moscow on the defensive — a gambit that could also leave Ukraine exposed.
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Russia Begins Moving Some Troops From Ukraine to Repel Kyiv’s Offensive

Russia has begun moving some troops from Ukraine to deal with a Ukrainian incursion, the U.S. and Ukraine say. But Moscow appears reluctant to withdraw units from hot spots in eastern Ukraine.
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NASA Is Still Deciding How to Bring Boeing Starliner Astronauts Home

After agency officials said last week that a decision was pending, they said on Wednesday that deliberations were still taking place.
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For Stonehenge’s Altar Stone, an Improbably Long Ancient Journey

A six-ton megalith at the heart of the archaeological site traveled more than 450 miles to get there, a new study concludes.