| "It's rather an amazing story that he did this all on his own," a mathematician tells us. | |
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| Some believe it's an extraterrestrial spacecraft. NASA says it's probably just space junk. Here are the facts. | |
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Whether buying an air purifier or creating your own DIY filter, there are ways to protect yourself. |
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| We're addressing the tank's various weaknesses—at least, according to Russian propaganda—point by point. |
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| From "tank traps" to layers of barbed wire, the 600-mile-long frontline of the Russo-Ukrainian War is remorseless. Our reporter went on the ground with a brigade training to breach it. |
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| No one wants to be the first to test a nuclear weapon, but everyone wants to be second. |
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| One groundbreaking plane spurred the death of the radial engine, another was christened by a king. | |
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