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This is Scientific American's 60-Second Science. I'm Karen Hopkin. This will just take a minute. Every year, scores of manatees are killed by boats in Floridas waters. Their plight is an ecological concern. And everyone from marine biologists to Marg
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Finding a date for Prom can be a stressful experience for many. Just ask Sam Steingard. 对许多人来说,找一个毕业舞会的伴儿可能是一次压力满满的体验。那正好问问Sam Steingard吧! With the big date drawing ever nearer