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Science and Tech Actions Facebook Tweet Email The Science Of Spit Evolutionary geneticists and biologists have tracked a ghost species while studying human saliva and its evolution. Prev Next By: Megan Smith Posted Related StoryScientists Say Antarctic Animals May Not Be Safe From Human Pathogens Most Recent IOC bans transgender women athletes banned from Olympics AP via Scripps News Group Iran attacks Israel as President Trump weighs a potential land invasion Joe St. George Israel kills top Iranian naval chief as Gulf states accuse Tehran of fees AP via Scripps News Group Science and Tech The father of a sextortion victim praises ruling holding social platforms liable Scripps News Group Jury finds Meta and YouTube liable in landmark social media addiction trial Maura Barrett NASA announces ambitious plans for a space station on the moon Jackie Wattles, CNN Watch Scripps News on your favorite app or smart TV. About Scripps News Download the Scripps News app