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The Silver Iodide Generator
In 1949, Irving Langmuir and Vincent Schafer set up camp in New Mexico. They wanted to see if dry ice could conjure rain from an arid sky. Bernard Vonnegut had brought along a silver iodide smoke generator he'd made in the lab. He sent up balloons to check which way the wind was carrying the smoke. By lunchtime, clouds were building near the mountains. Was that thunder? It was nearly time for Vincent Schafer to take off with dry ice in a B-17 bomber so Bernard turned the smoke machine off. When Schafer got to the clouds, he was surprised to find they were already raining. This was even better than dry ice.