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A line of clouts stretches from the tropical Pacific to western North America where it becomes a massive storm.
Photo Credit
Stuart Rankin via Flickr (CC BY-NC 2.0)
The Pineapple Express — an atmospheric river originating in the tropical Pacific — walloped western North America in February 2017. These systems are becoming more frequent at higher latitudes, leaving mid latitudes drier.

Atmospheric rivers are shifting toward the poles, possibly following a long-term cycle

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Laser reflect on optic table un quantum laboratory
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iStock
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A ranger watches hippos through binoculars.
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Narvikk vis iStock
A ranger watches hippos in the Akagera national park, Rwanda, which is managed by the NGO African Parks. Management of many of the continent's protected areas is being transferred from governments to nonprofit NGOs.
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Headshot of Herbert Kroemer
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Courtesy image
Herbert Kroemer
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lfireflies looking like yellow circles in the early evening
A long-exposure shot of fireflies in Thailand
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Sand dunes surround palms, trees, shrubs and a small lake in the UAE.
Photo Credit
Jing Yang via iStock
A desert oasis is perhaps the most striking example of a groundwater-dependent ecosystem.
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Fishing boats in Peru
Photo Credit
Renato Molina
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orange and black butterflies on a branch
Monarch butterflies undertake a multigenerational migration that covers thousands of miles
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hand holding a small white device
Photo Credit
Matt Perko
The small, wearable device is part of a system that monitors drug concentrations and delivers accurate dosages