Climate models project 21st century global temperatures. NASA's Scientific Visualization Studio and NASA Center for Climate Simulation hide caption
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Monday
President Obama (from left), French President Francois Hollande and Microsoft co-founder Bill Gates applaud a speech during the Mission Innovation event at the UN conference on climate change Monday in Paris. Jim Watson/AFP/Getty Images hide caption
A building called Sustainability Base, at NASA's Ames Research Center in Mountain View, Calif., has an energy-efficient design that allows in sunlight. So for most of the year, the interior is illuminated by natural light. Dominic Hart/NASA hide caption
NASA Uses Lessons From Space To Design An Efficient Building
A view of the opening of COP21 on climate change Monday in Paris. More than 150 world leaders are meeting for the 21st Session of the Conference of Parties to the United Nations Framework Convention on Climate Change. Patrick Aventurier/Getty Images hide caption
A power-generating windmill turbine is seen in front of the Arc de Triomphe on the Champs Elysees avenue in Paris ahead of the COP21 World Climate Summit, which begins Monday. Christian Hartmann/Reuters /Landov hide caption
Patients Want To Price-Shop For Care, But Online Tools Unreliable
Delegates from about 170 countries gathered in Kyoto in December 1997 during the United Nations Framework Convention on Climate Change. This year in Paris, the stakes are even higher, negotiators say. AFP/Getty Images hide caption
Kyoto Treaty Fizzled, But Climate Talkers Insist Paris Is Different
Sunday
A Star-Crossed 'Scientific Fact': The Story Of Vulcan, Planet That Never Was
Friday
Oranges ripen in a grove in Plant City, Fla. Citrus greening, a disease spread by a tiny insect that ruins oranges and eventually kills the trees, has put the future of the state's $10 billion citrus industry in doubt. Chris O'Meara/AP hide caption
Deforestation in Rondonia has increased by 41 percent. Kainaz Amaria/NPR hide caption
This year's flu vaccine protects against a few different virus strains, including the H1N1 seen here. The fuzzy outer layer is made of proteins that allow the virus to attach to human cells. NIAID/Flickr hide caption
Inside Each Flu Shot, Months Of Virus Tracking And Predictions
An illustration shows what a helicopter drone would look like on the surface of Mars. NASA/JPL-Caltech hide caption
Someday A Helicopter Drone May Fly Over Mars And Help A Rover
Thursday
An image of Ceres taken by NASA's Dawn spacecraft shows the two mysterious, bright spots on the dwarf planet. NASA/JPL-Caltech/UCLA/MPS/DLR/IDA hide caption