 was studying the gastrointestinal tract of human beings in the 40s 50s and 60s he'd been doing this work a long time well all of a sudden in the mid-60s bacterium that had been in the human gastrointestinal tract just started disappearing some of them he's like where are they all going well if you look back what happened in the mid-60s after world war ii the chemical companies were then making you know chemical warfare stuff and they had to keep making money