Zach Whitener, research associate at the Gulf of Maine Research Institute, holds a cod while collecting samples for a study. Gulf of Maine Research Institute hide caption

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Imagine a bar without the booze. Delegates wrangling in Bonn, Germany, this week have to figure out soon how to cover the world's climate bill. Oliver Berg/DPA/Landov hide caption

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Using an instrument they've named the HOLODEC, for Holographic Detector for Clouds, scientists can now see in fine detail the way air and water droplets mix at a cloud's wispiest edge. iStockphoto hide caption

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Gulping down coffee to stay awake at night delays the body's natural surge of the sleep hormone melatonin. Hayato D./Flickr hide caption

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The Antarctic ice sheet stores more than half of Earth's fresh water. Scientists wondered how much of it would melt if people burned all the fossil fuels on the planet. UPI /Landov hide caption

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The Two-Way

What Would Happen If We Burned Up All Of Earth's Fossil Fuels?

Scientists used an estimate of how much fossil fuel is left in the ground to do computer simulations and come up with a worst-case scenario.

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National Geographic paleoartist John Gurche used fossils from a South African cave to reconstruct the face of Homo naledi, the newest addition to the genus Homo. Photo by Mark Thiessen/National Geographic hide caption

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A child suffering from dengue fever lies in a bed in the isolation ward of a Rawalpindi, Pakistan, hospital in November 2013. There is no treatment for dengue, whose symptoms include fever, severe joint pain, headaches and bleeding. Muhammed Muheisen/AP hide caption

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An impala strikes a pose under a forest canopy in Zimbabwe. Morkel Erasmus/Getty Images/Gallo Images hide caption

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Delegates took their seats during the plenary session at the Bonn climate change conference on March 10, 2014. Negotiations resume this week; by the end of the year, the U.N. hopes to have forged a new global agreement. UNclimatechange/Flickr hide caption

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Male and female tungara frogs. Among these frogs, the guy with the best call usually wins the gal — except when you throw a third-choice loser into the mix. Alexander T. Baugh/Encyclopedia of Life hide caption

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A brown bear in its natural habitat. Wildlife ecologists in Minnesota found that black bears in their study experienced an increase in heart rate when buzzed by drones. iStockphoto hide caption

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A juvenile California two-spot octopus (Octopus bimaculoides). Michael LaBarbera/Nature hide caption

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