reporting from washington, i am jane o'brien. global stocks swing wildly as governments around the world seek any stability. cracking down, more arrests made as british political leaders said a sharp message to the rioters. >> we will track you down, we will punish you. you will pay for what you have done. >> and a summer vacation that will give you chills. in iceberg alley, mother nature puts on quite a show. >>> welcome to our viewers on pbs in america and around the globe. the world's markets these days are defined by volatility, and again today that reigned supreme. after huge losses yesterday, european and u.s. markets came back strong, with the dow gaining more than 400 points. in britain, the finance minister warned these are the most dangerous times since the banking crisis three years ago, and italian officials are calling for tough austerity measures. >> for markets, italy is the financial irruption they fear. this country is too big to be bailed out if they cannot meet their debt repayment. on the streets of naples, ev