National Geographic World's Largest Underwater Cave Discovered 2018-01-17T20:47:25.000000000+00:00 Joining two previously known underwater caves, the newly discovered system is 215 miles long. This Rat-Free City Park Is a Paradise of Rare Birds 2018-01-17T20:39:55.000000000+00:00 Since a park in Wellington, New Zealand, fenced out rats, stoats, and other predators, rare indigenous birds have returned to the city. What Makes This Flu Season So Bad 2018-01-17T19:38:55.000000000+00:00 A dangerous strain paired with less effective vaccines has created a dangerous recipe for illness. Venomous Sea Snake Found Off California—How'd It Get There? 2018-01-17T19:07:00.000000000+00:00 The yellow-bellied sea snake usually roams the world's tropical oceans. The Science Behind the Meteor That Lit Up the North American Sky 2018-01-17T17:13:09.000000000+00:00 What's the difference between a meteor, a meteoroid, and a meteorite? A Running List of How Trump Is Changing the Environment 2018-01-17T15:30:00.000000000+00:00 The Trump administration has promised vast changes to U.S. science and environmental policy—and we’re tracking them here as they happen. Watch Wildlife Crime Evidence Go Up in Flames to Protect Species 2018-01-17T15:28:11.000000000+00:00 Authorities in Indonesia destroyed a stuffed tiger, boa skins, and other contraband to ensure they don’t leak out of government possession and back onto the black market. Vintage Video Explains How Road Maps Were Made in 1940 2018-01-16T23:26:58.000000000+00:00 See how mapmakers painstakingly kept pace in an era when America’s road network was constantly expanding. Your Bright Idea Could Save the Biggest Reef on Earth 2018-01-16T20:26:48.000000000+00:00 Australia is calling on scientists from around the world to help rescue the Great Barrier Reef. What Wiped Out the Aztecs? Scientists Find New Clues. 2018-01-16T19:53:00.000000000+00:00 Salmonella could be partially to blame for a 16th century epidemic that killed millions.