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- #11
From what I've read, it's something to do with light refraction. Since the water in the baggies makes the light bend, it confuses the flies who have 2 complex eyes and within these eyes 3,000 to 6,000 simple eyes. The flies base their sense of direction on where the sunlight is coming from. When the flies complex eyes see refracted light through the bag of water it's enough to confuse them and they fly away.