katelyn jetelina: so there is a unique and very new program by the federal government. it's called the bridge program, and it's just for covid-19 vaccines, but it provides free shots this fall to under and uninsured people. and there's three places you can really kind of find these free shots is one, health care providers, two local health centers and three. and probably most popular is pharmacies like cvs and walgreens. john: katelyn jetelina of the newsletter "your local epidemiologist." thank you very much. katelyn: thanks for having me, john. john: you can read more about how uninsured adults can get covid vaccines at our website , just.org/newshour -- pbs.org/newshour. ♪ john: 50 years ago this month, president richard nixon signed the endangered species act into law. one of the first on the endangered list, the black-footed ferret, north america's rarest animal. they were once thought to be extinct, but thanks to the work of dedicated conservationists, they're making their way back. we went to see some of that work for this report, part of our ongoing series, "sav