chinese researcher zhao zhang flew all the way to dallas to show off his new smart food tag. >> i'm a >> reporter: gel-based tags are placed on the packaging and change color over time, mimicking the rate at which food goes from fresh to foul. red means the food is still fresh but as the food starts to go bad, the tag changes color. green means the food is spoiled. zhang is now trying to sell his invention to foodmakers. he believes one day it could help parents like casey from throwing out valuable food that's still good and avoiding food that's gone bad. omar villafranca, cbs news, dallas. >>> when we return, subway attack. a rider violently charges an officer on the platform in front of the train full of passengers. of passengers. [ woman #3 ] to travel the world without leaving home. [ male announcer ] whatever the reason. whatever the dish. make it delicious with swanson. and irresistible aroma of nescafe clasico stir what's inside of you. ♪ [ engine revving ] [ tires screech ] ♪ [ male announcer ] that was bold. real bold. ♪ so we made our own commercial to tell you why. chex ma

being the service will meet with local climate is cool and if he isn't the last was an honest goes to zhao what that mean for buying it. and the initial them on the pitch i think the gory effects this season. you know anything it'll cool place to get the mail man to win a title for only fourteen saddle. and i think a day in the medium term it said send me a bit more interesting. i recommend december is being groomed as his replacement keys to psychics aisle he's a bit more great seats. once a paternal so that'll be. i can see how tough it out now and nothing to do so by news that injustice is done on site layouts recently for understanding your a stake in the cup to their own seat dancing on the structures that tennis is in place ensuring even if he does end up in prison. seems like nothing ends up mighty mind as god thank you very much for the inside one of the life story of the hanna's is a true rags to riches tale that's taken a very unfortunate west has indeed the son of a butchered joined by munich in nineteen seventy the first successful player the leader then he became the club's ma

zhao and dome. >> : at the knee and just watch journeyman field on television was there any doubt aboutome people think he's too short some people think he's too cocky and some people think his skills from college don't go to the trust. and mitchell is a free education is enough for these athletes another one former union. >> : he never answered back all those people talk about you and twitter. that's on some wacky. if you been doing this a long time especially on radio people talk want all the time most people to read and do all that other stuff predominantly negative i prefer to live a happy life like catherine in. airline in fact one of the katherine he nan of sports just happy and walks through life without a care. right after the break genin sonics fans there's a line shortage. grant coming up with that story next >> : in other news i'm giving away top-of-the-line portable back up hard drives. seagate slam as the miss this source solution on the market offers 2 terabytes of storage and that's in the palm of your hands asfour or than 1000 issues. you can win one of these on kron4-do

. >> the man in charge of the project is zhao. >> we are looking for the smart people.data. >> what part of their genes are the same? >> yeah, that's important. >> one of the people selected and who volunteers his dna is boston software developer, jeffrey kaufman. >> this is something if executed well could be very positive for our society. and for the world. >> but discovering the genetics of intelligence could be controversial. it would be possible to test a human embryo to learn if the baby is destined to be smart. in vetro labs. bgi believes one day there may be a test for iq. >> in the future you are saying people could select for intelligence. >> the technology will be there. >> and given the choice most parents are going to rather have a more intelligent baby then a less intelligent baby and all other things considered and for the most part that seems like it should be a good thing. >> the fear is china could unleash a future of designer children. the stuff of science fiction. >> the 1997 film envisions the ethical dilemmas in a society that screened out human im