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VISITORS: Due to inclement weather, the Smithsonian's National Zoo will open at 10 a.m. today, Jan. 17, 2018, 
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Earth Optimism: Saving Frogs with Science

Smithsonian Conservation Biology Institute scientists are saving frogs with science. Release trials in the wild begin spring 2017. On Earth Day weekend, the Smithsonian is convening the Earth Optimism Summit, an event about the science that's working to solve complex conservation challenges around the globe.