a critical life line is having a difficult time across rural america. ambulance services running out of money and volunteers. an eye-opening report is up next. a quick note here to tell you about tomorrow. be sure to watch an all-new episode of the cnn original series "the story of late night." because this week, johnny carson's 1992 retirement really touches the nation and touches off an epic late night war between jay leno and david letterman. >> here is bette midler. >> i can't believe it! the last -- the last guest! ♪ quarter to 3:00 there is no one in the place except you and me ♪ >> this was johnny carson! this is what america knew for 30 years. there was that i want tintimacy