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Stock image: an automated piece of machinery.
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The study, in Monday's Proceedings of the National Academy of Sciences, used satellite and ground measurements to track nitrogen oxides, a major ingredient in smog. Levels fell 7 percent from 2005 to 2009, but only dropped 1.7 percent from 2011 to 2015.

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The lifespan of a trapdoor spider is between five and 20 years.
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Oak Processionary Moth (Thaumetopoea processionea).
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