民主党呼吁美移师巴基斯坦(1)
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科学60秒:寄生虫的阿基里斯之踵
Every villain has his Achilles' heel. And microscopic scoundrels are no exception. The challenge for those who wish to ____1____ microbial bad guys is to identify that weak spot. Now, scientists ...
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西点军校的军事教育Hints:BrazilHudson River Claudio Messias Gentil General George WashingtonThomas Jefferson Today we answer a question from Brazil. Claudio Messias Gentil wants to know about the ...
冷藏食品的一些小贴士(1)
食物冷藏的一些方法。Hints:evaporative cooler organism damageBefore refrigerators were invented, the next best thing was an ice box. But another way to keep food fresh is to use an evaporative coo...
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这是真正的“空中”教室,他们在宇宙空间站接受学生来自地球的提问"Good morning, Discovery Center -- good afternoon. We're happy to be here with you. This is Al Drew, Clay Anderson, Dave Williams and...