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国际新闻
Why has Putin added 15,000 new soldiers to Russia’s army?
The move marks the fourth military expansion this year as Russia's war in Ukraine seemingly stalls.
Al Jazeera – Breaking News, World News and Video from Al Jazeera ·
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科学与环境
For the first time, scientists watch sound jump between quantum states
Stanford researchers have recorded the first real-time quantum jumps of sound, watching single phonons abruptly vanish from one energy state to another. The breakthrough could open new paths for quantum computing, error correction, highly sensitive biological sensors, and next-ge
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