than 170,000 people after world war ii to just over 50,000 today, as mass tourism pushes costs up and niane a endangered species. food deliveries are one way to save them from extinction. rain or shine they deliver from drop-off points in the city. so you think this is really important? >>> yes, says this customer. and it's so inspiring to see it delivered in a traditional venician boat. in a city with no cars, volunteers also deliver medicine by foot. >>> it saved your life. me with my broken arm, she says, and my 90-year-old mother. she calls the volunteer her angel. >> it could be your grandparents. it would be your elderly aunts or family member. so you find lonely people that maybe sometimes need also someone who is friendly with them, someone who is caring somehow, and it feels very nice. >> reporter: delivering food, medicine and also solidarity. to a battered city with a unsinkable way of life. chris lifesay, cbs news, venice. >> and that's the overnight news for this wednesday. for some ofyou, the news continues. for others, check back later for "cbs this morning" and follow us onl