Hummingbirds in the Peruvian Andes enter a state of torpor at night to conserve energy, dipping their body temperature to as low as 38 degrees Fahrenheit. Christopher Intagliata reports. 
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High-Elevation Hummingbirds Evolved a Temperature Trick

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Science

After years of delay, researchers are ready to inject carbon dioxide into jungle plots.
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A Singular Climate Experiment Takes Shape in the Amazon

Years in the making, a project in the Amazon rain forest is finally set to determine whether a rise in carbon dioxide could save one of the world’s largest carbon sinks.
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Will the Amazon Help Save the Planet?

Cows and at least one person in the U.S. have been sickened by avian influenza. We asked experts about the risk to humans.
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How Big a Threat Is Bird Flu?

Volcano detectives use artificial intelligence to sleuth out ancient secrets in Alaska.
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How a New AI Model Helps Volcanic History Rise from the Ashes

These marine mammals are very hard to observe, but in the past two decades the roughly 20 or so people in the world who study sperm whales have found some compelling evidence of culture among them.
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High-Elevation Hummingbirds Evolved a Temperature Trick

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