Last fall, Janna Greenhalgh ’01 (CLAS) tried to make it rain over Saudi Arabia by spraying a salt mixture into thunderstorm clouds from flares attached to her small plane. The technique, called cloud seeding, increases precipitation — particularly welcome there, as the dry kingdom gets less than four inches of rain a year. A natural resources pilot, Greenhalgh typically flies over her home state of Idaho, triggering mountain snow that will melt and bring water to that desert-like region.
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