If humanity hadn't been infected with this retrovirus, so in early ancestry of humanity, humans would reproduce by laying eggs as well. 90% of the bacteria in our gut is capable of producing neurotransmitters. So chemical messengers like dopamine serotonin that are capable of influencing human moods. It seems like over millions of years, these bacteria have evolved to communicate with us because perhaps they realized that they're not able to communication with us. Because if we're more gregarious, if we're happier, we're going to go out and socialize and we'll provide opportunities for these bacteria to colonize another body.

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