at the new york stock exchange, i'm susan mcginness. >>> a life-saving swap. six people involved in a kidney transplant today, meet at the baltimore hospital, where their lives changed forever. andrea fujii has the touching story in tonight's tonight's healthwatch. >> reporter: three lives saved from three strangers. they're meeting for the first time. >> that's just unbelievable that someone would do that. >> reporter: one-third of donors and recipients are incompatible. so the paired kidney exchange program matches the toners with someone else. >> reporter: paul mcsorly needed a kidney and his twin offered hers. not matches, joyce of joy's kidney went to john becker. his wife was his intended owner, but hers went to may opi. and then another went to paul. >> throw families that have been touched because three people willing to donate. >> to be unselfish liesh this is just unbelievable. >> reporter: all six surgeries occurred june 16th, lap scopically at the university of maryland medical center. >> she said, my kidney is really working well. i was like, awes

susan mcginness, cbs news, wall street. >> here's a look at the closing numbers. bad news about jobs pushed the dow down 62. s&p was off 9. nasdaq is down 13. >>> more than 6 million americans are now considered a long-term unemployed, meaning they have been out of work for six months or longer. >>> a maryland lawmaker is demanding an investigation into the state's sharp toll increases. senator e.j. pipkin wants to know exactly how the maryland transportation authority arrived at the conclusion that a massive toll hike is necessary. he says he's asked for figures and documentation, but so far, he hasn't seen any. senator pipkin also claims mdta has not accounted for millions of dollars in bay bridge toll revenue. >>> what the future holds for the charles village crowd. >>> death threats for casey anthony's family. the new concerns for her safety. >>> bay city transplant. complete strangers meeting for the first time. i'm andrea fujii. their touching story just ahead. >>> strong storms around maryland. bob turk has an updated look at live doppler radar. >>> univers

i'm susan mcginness in new york. >>> making math fun. thousands of city middle schoolers are raising their minds. andrea fujii has more on this wjz sum schoolwatch report. >>> on your mark, get set, learn. 2,000 middle schoolers are taking part in the grand prix of summer learning. named after baltimore's big race in september. it's the second year for this five-week course in which city students build their math skills through activities like racing cars. >> you just get caught up with so much fun that you don't each realize that you're learning anything. >> reporter: other activities include swimming with michael phelps' instructors. >> reporter: after scores from the maryland student assessment showed a drop in math, organizers say this program is essentiality. >> we know -- essential. >> we know for middle school students, math is essential. and we want to hone in on those skills. >> reporter: the federally- funded program is free. >> kids are getting an opportunity to work with math in a real-world context. >> reporter: then jump to