The Mystery of Yellow Rain Summary

NOVA explores whether "yellow rain", described by members of the Hmong tribe of Laos, is a form of chemical warfare - or a naturally occurring phenomenon.

NOVA Season 12 Episodes...

NOVA Show Summary

Seen in more than 100 countries, NOVA is the most watched science based television series in the world and the most watched documentary series on PBS. It is also one of television's most acclaimed series, having won many major television awards, most of them many times over.

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