Yellow RainMai Der Vang In this staggering work of documentary, poetry, and collage, Mai Der Vang reopens a wrongdoing that deserves a new reckoning. As the United States abandoned them at the end of its war in Vietnam, many Hmong refugees recounted stories of a mysterious substance that fell from planes during their escape from Laos starting in the mid 1970s. This substance, known as yellow rain, caused severe illnesses and thousands of deaths. These reports