Teaching AI models to say “I’m not sure”

Confidence is persuasive. In artificial intelligence systems, it is often misleading. Today's most capable reasoning models share a trait with the loudest voice in the room: They deliver every...
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Mysterious rings around Uranus point to hidden moons orbiting the ice giant

New observations of Uranus's enigmatic outer rings have shown them to be even more mysterious than astronomers had thought, and their unusual properties hint at some puzzling things going on with...
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The moon and Jupiter steal the show after sunset tonight

On Wednesday evening (April 22), assuming your skies are reasonably clear, you can finish your day by stepping outside and enjoying a view of a rendezvous of two of the brightest objects in the...
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Spectacular photos of the 2026 Lyrid meteor shower captured from Earth and space

The Lyrid meteor shower put on a spectacular show last night as Earth plunged through the debris stream cast off by comet C/1861 G1 (Thatcher), triggering a peak of activity that saw shooting stars...
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Happy Earth Day! Celebrate with these amazing photos of our planet from space, from Apollo 8 to Artemis 2

This Earth Day, we're taking a moment to contemplate our planet, exploring humanity's changing perspective of Earth as seen from the vastness of space throughout history. Here are a few paraphrased...
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The Nancy Grace Roman Space Telescope, NASA’s next great observatory, is finally complete

Here are a few paraphrased options, each with a slightly different emphasis: **Option 1 (Focus on the milestone):** > GREENBELT, Md. — A significant milestone was reached Tuesday at NASA's Goddard...
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NASA shuts off another Voyager 1 instrument ahead of risky ‘Big Bang’ maneuver to save power

**Voyager 1 Powers Down Science Instrument to Conserve Energy Ahead of Major Mission Boost** In a critical move to extend its operational life, NASA has deactivated one of the final science...
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