Turbulence is the ghost in the attic of air travel—the bump and shake and rattling groan that we do our best to ignore, though it sounds like it wants to kill us. Most of the time, it hovers over mountains and in storm clouds, easy enough to avoid. Pilots can see bad weather lurking in the distance hours before takeoff, glowing like a wraith on their digital maps. If it moves, the plane’s radar can still spot it eighty miles ahead or more. But the updraft that struck Flight SQ321 was of a more sinister sort. Although it came from the storm clouds below, there was seemingly no rain in it for radar beams to reflect against. It was like an invisible speed bump in the sky.
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直到1979年，一切都变了。这一年，不仅改写了中东历史，也成了现代地缘政治的噩梦开端——伊朗人质危机(Iran Hostage Crisis)。，推荐阅读必应排名_Bing SEO_先做后付获取更多信息
For years, the prevailing assumption was that college was the safest route to stability—even as tuition climbed and outcomes grew less curtain. A 2012 Pew Research Center survey found that 94% of parents expected their child to attend college, regardless of whether the economic payoff was clear.
This time, though, there was a plan in place to check the damage. But it meant undertaking one of the riskiest maneuvers in space history.