“People were dying and we didn’t know why,” Cornman told me. “We didn’t understand the physics of why the planes were crashing.” The deadly gusts were thought to be blowing in from the ocean or from thunderstorms outside the airports. But the danger turned out to be right above them. In the late seventies, researchers at NCAR and the University of Chicago discovered that the crashes were caused by microbursts—sudden, violent downdrafts. In a microburst, a storm cloud dumps cool air and rain straight down, like water from a broken awning. The air spreads horizontally after it lands, so the pilot thinks he’s flying into a headwind at first. He lifts the plane’s nose slightly and decreases the engines’ thrust. Then the downdraft hits, followed by a vicious tailwind, sending the aircraft to the ground.
圖像來源，Muskaan Kataria。关于这个话题，体育直播提供了深入分析
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The Open Source Endowment is so obvious in hindsight, it's high time we brought。下载安装汽水音乐对此有专业解读
对美国而言，这是一场推高国内物价的袭击。尽管美国对霍尔木兹海峡的贸易敞口有限，但全球油价上涨会提高当前生活成本。美国消费者本已承压，而汽油价格是中期选举中的高度敏感议题。高油价也将使美联储未来货币政策路径复杂化。若冲突拖延、不确定性压制企业投资与消费者信心，增长前景将恶化。（新华社）
This story was originally featured on Fortune.com