Question: First, let me say that the aliens being affected by only the "contaminants" in the tap water seems to be wrong. Two reason: 1)The Indian vet mentions that they don't like water, and 2) the aliens were avoiding areas with large bodies of water nearby. My question is this: wouldn't humans, who are over half water, be toxic to the aliens? Even if they processed the humans with different equipment and took precautions to avoid blood or body fluids, wouldn't carrying off a sweaty person burn the aliens? Seems like a dangerous harvest.
Soylent Purple
24th Jan 2006
Signs (2002)
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Answer: It could be that they are affected by the chlorine in the tap water (humans are affected by chlorine to, just look at Mustard Gas) to a greater extent then humans. The vet is only speculating about the landing sites. And while it is true that humans are mostly water, it is saline (i.e. salty like sweat) and has different chemical properties to pure H2O.
Soylent Purple
Well water does not contain chlorine.