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>> concerns about united states joint military drills with south korea. >> panic on the new orleans parade route. >> a gunman opened fire. >> mardi gras back to pre-pandemic levels. e policeorbr n an arrest in connection with the catholic bishop shot at home. >> woman killed in an alligator attack in a florida retirement community. >> what i have to say tonight doesn't come from here. it comes from here. >> norah: good evening and thank you for joining us as we begin a new week together. tonight "cbs evening news" goes in-depth with a look at how americans are exposed to chemicals...

>> i think the number one thing is meeting people. the world is full of the greatest, most exciting, most interesting people. >> reporter: we met in london, quick transit before africa and they shared a secret. >> we both have total knee replacements. >> reporter: you're walking around the whole world. no issues whatsoever? >> no! do you think we've got any issues? >> reporter: ellie is a documentary photographer. sandy is -- they clicked two decades ago. they pack light and travels cheap. for people who say i am too old to do what you're doing, what do you say to that? >> don't sit in that ch...