Could mankind soon be living beneath the ocean? Experts analyse the key issues behind creating a viable undersea community.
When British Midland Flight 92 has an engine fire, the pilots try to make a landing, but the second engine fails before they can get to safety.
The tornado that struck Oklahoma in 2013 was the largest, one of the fastest, and, for storm chasers, the most lethal twister ever recorded.
US military site Area 51 is the subject of wild speculation and conspiracy theories. Now insiders reveal what really goes on behind closed doors.
Follow photographer James Balog across the Arctic as he uses time-lapse cameras to capture a multi-year record of the world's changing glaciers.
A Grey Wolf (Captive). This image is from Wild Yellowstone.National Geographic Channels/Ryan Sheets
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