The Zetas acutally have multiple brains in each one of them. So when they telephathically reach out to earth they are naturally drawn to schizophrenics.

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I must not PX. PX is the mind-killer. I will face my PX. I will permit it to pass over me and through me. And when it has gone past I will turn the inner eye to see its path. Where the PX has gone there will be nothing. Only I will remain.