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BLOOD RAIN in Kerala why and how   Blood rain, also known as red rain, is a phenomena in which blood appears to fall from the sky as rain. Cases have been documented since Homer's Iliad ( Greek Ancient poem ), written around the 28th century BC, and are common.Long before the arrival of the 17th century, it was widely assumed that rain was truly blood. The occurrence of blood rain was regarded a negative portent in cult practise, according to literature. It was used to foretell events, although while some of these instances may be fictional, others are historical. The blood rain phenomena is now thought to be caused by aerial spores of the green microalgae Trentepohlia annulata, according to scientific consensus . References in Literature . The earliest literature instances was found in the homers Iliads in which Zeus is responsible for the blood rain twice the same kind of things can be seen in the work of the famous poet Hesiod's  , in around 700 BC . Famous Greek biographer