Tammy gives our viewers some science 101 on precipitation, impurities in water and what causes it to freeze. The reason she gets into the conversation is one of the main studies we do now in the sierras is chemtrails. Whether you realize it not all of them are harmful some is just condensation from the airliners. While others are made by craft I never see and reside up in the air for hours without ever dissipating. More then often when many chemtrails appear over a certain quadrant within those three hours the sky darkens and generally it precipitates. There might be some weather modification occurring in the sierras. Honestly the sierras lakes, rivers, streams and reservoirs are running dry due to mild winters and lack of rain.