michael moore be in beatrice hahn of the scientists who with their colleagues in labs have done. so there are these diseases. the spillover. they are zoonotic. one other slightly technical term i want to familiarize you with his reservoir hosts. the reservoir hosts is a kind of animal which the bug, virus or whatever it is list indefinitely, permanently, inconspicuously without causing disease, without causing mayhem in the particular creature. why does that live there commence late? why does that live there nondestructively? probably because it's been in the species for millions of years in an accommodation has evolved. so virus in its west of our hosts replicates, but doesn't replicate cataclysmic way. i replicate slowly and doesn't generally cause symptoms. so it's invisible. it hides in its reservoir host and then something happens. humans kill and eat the reservoir hosts, come in contact with it somehow. also a couple stories about ways this can happen. the reservoir host sheds virus in the virus gets into humans to become the zoonotic disease. one thing scientists do with t