irs takes identity theft very seriously and we re working to stop it. reporter: the agency has now installed computer filters to flag suspicious returns. still are you getting a lot of calls like this today? yes, we are. it s been really bad this year. reporter: there s no easy fix. i and other potential victims of this fraud first have to file a form, an affidavit with the irs to prove who we are. then it s likely to take months to resolve. lisa stark, abc news, washington. taking advantage of the dead. that s so twisted. and high-profile people who file for an extension include mitt romney and new jersey governor chris christie. so just fun facts. we ll be back in a moment. stay with us. announcer: abc s world news now will continue after this from our abc stations. welcome back, everybody. there s some delicate surgery
add caffeine, blood vessels constrict, less blood circulates in the brain and your blood pressure and heart rate go up. if you skip your regular coffee, that surging blood can trigger a caffeine headache. it s like trying to get a fire hose to pump blood up through your skull. if you are a caffeine lover, your brain has actually changed. it now functions normally on caffeine. how much caffeine do i have to drink to change the physiology of my brain? not very much. like even a cup a day? one cup a day will change your brain. reporter: the good news, for healthy adults, a few cups a day is not dangerous. but keep in mind, a little caffeine can do a lot. lisa stark, abc news, winston-salem, north carolina. that explains it. there isn t as much blood. get this. there s good news here. coffee drinkers less like three have diabetes, parkinson s and dementia, fewer cases of cancer,
we re going to shoot him up and beat him. reporter: tactics like these are illegal too. for older debts the amount of time collectors can sue for payment varies state by state. anywhere from two to 15 years. but beware. why not agree to pay a little bit of the debt? why not just get these people off your back? in most states if you pay a little bit of the debt it actually restarts the clock. reporter: that means that old debt is suddenly reactivated and you can face a lawsuit after all. tim bond didn t fall for that. instead enlisting help from government consumer fraud officials. it worked. the company backed off. lisa stark, abc news, washington. that s horrific. where do they find these people? those phone calls? i m going to kill you? i m going to cut your dog up? i mean, are those calls like coming from some penitentiary somewhere? they probably are. it s the best in humanity coming out right there. you would think that it wouldn t be that hard to find some n
expect us. reporter: instead, anonymous is a loose group of internet hackers from around the world, making it much more difficult to know what they re going to do next and to stop them. lisa stark, abc news, washington. scary stuff. smart group. smart guys. coming up, questions about madonna s halftime performance. and the big theme in last night s super bowl ads. we ll be right back right after this. ads. we ll be right back right after this.
70s. but how best to stay sharp? the answer may surprise you. it s exercise. it will get your heart to pump nutrients and oxygen to your brain cells. chemicals will cause those brain cells to actually sprout out and communicate to each other more effectively. reporter: also critical, what you eat and how you feel. we want to eat a brain-healthy diet with fish, nuts, whole grains. we want to manage stress. chronic stress will shrink your brain cells. reporter: so take a brisk walk and then relax. your brain is really at the top of its game. reporter: now, doesn t that ease the mind? lisa stark, abc news, new york. so middle age is considered 40 to 65. so i ve got a couple. couple years. three. also what happens exercise and they say education. so college in the long run does you some good. love it. very encouraging. think about that. and we ll be right back. h@