The whole success of their plan depended on causing this excitement. And we're dealing, obviously, with hardened professional criminals. 'And you didn't think this worth mentioning to me,' I said heavily. 'Who were in the front two seats-those nearest the galley?' He had a gin soon after take-off, then switched off his reading light, draped a newspaper over his head and went to sleep.' And Mr Corazzini is the one person I'm sure didn't leave his seat before dinner. We know Marie LeGarde can't have had anything to do with it. 'I was a little upset for a moment, then Captain Johnson was in front of me shooing everybody back to their seats and I couldn't see.' They all seemed to crowd down past the middle-' 'There way a funny smell-' she began slowly. 'Of course.' She stared at me, wide-eyed.

Other volcanoes usually spew silicates, but the Ol Doinyo Lengai is the only one on the planet that spills 'natrocarbonatites' as cool, runny, dark washes.She looked at me for a long moment before answering, and even in the fading light of the aurora I could see the understanding coming into her eyes. It's a favorite among petrologists because it's the only one of its kind, Hannes Mattsson, a researcher at the Swiss Institute of Technology in Zurich, told NBC News. The culprit is Ol Doinyo Lengai, a million-year old volcano just south of Lake Natron. Nick Brandt / Courtesy of Hasted Kraeutler Gallery A calcified dove, from Nick Brandt's book Across The Ravaged Land, published by Abrams, New York. How did the lake get this hostile? The 'salt' in it isn't the regular table variety harvested from seawater, but magmatic limestone that's been forged deep in the Earth, poured out in runny lava flows and blasted into the air to become ash clouds 10 miles high. Water levels fluctuate easily because it's so hot - when the levels drop, the corpses are left behind on the shores, coated in salt, exactly how Brandt found them. Small birds or bats that try and fail to cross the 12- by 30-mile lake fall in, as do insects like beetles and locusts. Flamingos are some of the lucky birds that can make the trip across the lake which is 30-miles wide at its longest point. 'If a body falls anywhere else it decomposes very quickly, but on the edge of the lake, it just gets encrusted in salt and stays forever,' David Harper, an ecologist at the University of Leicester who has visited Lake Natron four times, told NBC News.

What is natron slat made of