Cloud seeding is a type of weather modification that aims to change the amount or type of precipitation that falls from clouds by dispersing substances into the air that serve as cloud condensation or ice nuclei, which alter the microphysical processes within the cloud. The usual intent is to increase precipitation (rain or snow), but hail and fog suppression are also widely practised in airports where harsh weather conditions are experienced.

Cloud seeding also occurs due to ice nucleators in nature, most of which are bacterial in origin.[2]

Note: Chapter Six (6) "The War Ends as I Discover Cloud Seeding" Schaefer discusses the conversations with Langmuir while climbing Mount Washington (pg 118-119) and then describes the event "My Discovery of Dry Ice Seeding" on pages 128-129. References by his son, James M Schaefer, Ph.D. 6-24-2013

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