optimism
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Study: Pigs Are Either Optimists or Pessimists With Occasional Mood Swings
Pigs are much more like humans than you think.
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![Climate Change is Reducing Dust Levels Worldwide as Arctic Temperature Warms [Study]](https://1471793142.rsc.cdn77.org/data/thumbs/full/70320/280/157/50/40/climate-change-is-reducing-dust-levels-worldwide-as-arctic-temperature-warms-study.jpg)
Climate Change is Reducing Dust Levels Worldwide as Arctic Temperature Warms [Study]
