. >>> also actor and comedian denis leary is with us.ighters who talk about their battle against widespread arson in the city. it's become a dangerous epidemic. he just signed on as one of the executive producers. he's going to let you know how you can pitch in. also tell you more about the firefighters that inspired that documentary. and about the real dangers folks in detroit are facing every day. >> finding a free wifi hot spot. >> a recent study found just two-thirtds of wifi users have taken the recommended steps to protect their personal network. susan koeppen of kdka has more. >> reporter: free wifi is everywhere. there are more than a million hot spots worldwide. from coffee shops to airports to hotels. >> how secure do you feel using wifi at a coffee shop? >> i feel really secure. >> reporter: according to a recent study, americans get a "d" when it comes to wifi security. >> consumers should be very, very cautious when using publicly available wifi. >> we wanted to see how easy it is for someone to steal your information while