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System keeping track of exactly what kids are eating in school calf cafeterias and how much. this experimental project used digital cameras and trays that have bar codes on them to count exactly how many calories each child is eating. joining us on the phone is the head of that program, dr. roberto trevino, the director of the social and health research center. so the idea is each kid has an assigned tray, each tray has a bar code on it. when they get their lunch out of the cafeteria, a camera reads the bar code and figures out exactly what the kid -- takes a picture, really, of what the kid h...

People used to bump into you and pull that wallet. they can do this electronically now? how are they doing this with little scanners? >> the new technology they pick up waves transmitted through antennas from ten feet away. >> how does my credit card send out a signal that can be taken. do people even realize it? >> it's funny. this technology was patented in 1983. it was going to take over bar codes. when you see people in the grocery stores using scanners, they get information for inventory. >> so a gas station or a gas company was the first to do this. >> with express pay. you swipe your ca...

Your pockt and steal your card numbers. the expiration dates, as well, sometimes other personal information and they can do this, these thieves, from as far as ten feet away from you. clyde anderson helped explain this to me how these things work and how you can save yourself. >> the new technology rfid. you can pick them up from as far away as ten feet. >> is my credit card sending out a signal. do people even realize? >> a lot of people don't realize the sit has happened. this technology was patent for the first time in 1983. it is more widely used. it will take over bar codes. a lot of groc...

The body to operating on the wrong parts of the body. then, infections acquired in the hospital. if you have a choice use a hospital that has bar codes. if you're undergoing surgery, make sure the doctor marks the part of the body where they should operate. lonnie wished his doctors had. we spoke to him after he went in for surgery on his right knee, but came out with doctors operating on his left. >> it makes me mad. i got two bad knees that don't work. >> they are costly errors. one study estimates these kinds of medical mistakes cost the u.s. more than $17 billion a year. sharyn alfonsi, ab...

Higher than you may want to spend. let's take a look first at gas buddy. it gives you a list of gas prices near you, tells the price per gallon. this could save you more than $100 a year if you go and do that. there's also thefind. that scans bar codes and it finds the best prices online and at retailsers near you that you could go to and it let's you know if there's coupons out there, as well. and grocery i.q. one scan the bar code with your phone. it will give you an exact shopping list, show you coupons that are available, put the lists in food groups, whatever you need to do, then e-mail t...