armen keteyian, cbs news, new york. >>> scott pelley will have a full report on these latest accusations against lance armstrong this sunday on "60 minutes." >>> jailed unabomber ted kaczynski won't give to fbi a sample of his dna. the fbi request is part of its ongoing investigation of the unsolved tylenol poisonings that killed seven people. kaczynski, in prison for mail bomb attacks that killed three, insists the agency already has evidence from his montana cabin that would exonerate him in the tylenol cases. >>> hollywood will have to wait for the big screen return of arnold schwarzenegger. the former california governor has postponed what was intended to be his movie comeback. as he braces for what could be a costly divorce. schwarzenegger and his wife maria shriver have separated over revelations that he fathered a child with their housekeeper. >>> and just ahead on the "morning news," the latest bad news on jobs. >>> plus a spacewalk for the crew of shuttle "endeavour." and some good news for the commander. you are going -- i didn't understand it. i found out that connected to our

armen keteyian, cbs news, new york. >> couric: turning to the u.s. economy now, it looks like gas prices may have peaked. the energy department reported today they rose just a penny in the past week to $3.975 gallon and home prices fell another 3% in the first quarter of this year. since the bubble burst five years ago, americans have seen the value of their homes fall nearly 30%. when we come back, a new study says autism may affect nearly three times as many children as we thought. . that's good. wow. this is really good. great flavor. it's really creamy, it's really tasty. ooh, wow! jamie lee curtis! it's activia. it's delicious. i am shocked. it's hard to believe it's that good for you. it's so good. try the fabulous taste of activia today. taste it, love it, or it's free. and now discover activia dessert. in rich, indulgent flavors like blueberry cheesecake. try activia dessert today. ♪ activia no, no, no... i do not have a thing about bugs. i have a thing about bugs in our house. we used to call an exterminator. ugh... now i go ortho. home de

katie. >> couric: armen keteyian. armen, thank you so much. and you can see the full report on lance armstrong this sunday on "60 minutes." now to a truly remarkable story, new hope for people with paralysis. there are more than 5.5 million in this country alone, including nearly 1.3 million with a spinal cord injury. now for the first time, a patient paralyzed from the waist down-- a 25-year-old man-- was able to stand up on his own and take a few steps. dr. jon lapook tells us the credit goes to an experimental new treatment. >> reporter: rob summers was a star college pitcher five years ago when a hit-and-run accident left him paralyzed from the waist down. >> they said "you'll never walk again, you'll never take a step, nothing." >> reporter: they were wrong. today, researchers working with the christopher and dana reeve foundation announced summers is the world's first patient to stand using a new therapy that could fundamentally change the treatment of paralysis. >> i stood-- independently stood. after not having moved anything for four

armen keteyian has the story. >> reporter: like his signature move in the mountains, lance armstrong went on the attack today. as he has repeatedly done in the past, he targeted the credibility of those who would accuse him of using illegal performance-enhancing drugs. his current target? former tour de france teammate tyler hamilton. in an interview to air this sunday on "60 minutes," hamilton tells correspondent scott pelley about his-- and armstrong's-- repeated use of banned substances, including the blood- boosting drug e.p.o. >> you saw lance armstrong inject e.p.o.? >> yeah, like we all did. like i did many, many times. >> reporter: on his web site-- factsforlance.com-- armstrong tore into hamilton, calling him "a confessed liar in search of a book deal." but it turns out the six-month- long "60 minutes" investigation into armstrong is anchored in far more than the on-camera accounts of hamilton and another former u.s. postal teammate, frankie andreu. instead, this sunday's report by pelley breaks major new ground based on evidence tied to an ongoing federal grand jury investi

cbs news chief investigative correspondent armen keteyian is here with details. good morning. >> good morning. i've covered the tour for five, seven years. this is by far the biggest mess that lance has ever been in. armstrong continues to deny any legal doping, attack being former teammate tyler hamilton who accuses him on "60 minutes" as not credible. but right now, lance armstrong is in the biggest mess of his life. >> lance armstrong! >> reporter: true to form, when threatened by rival riders, or his now-damning doping accusations, lance armstrong went on the offensive. his current target, a six-month "60 minutes" investigation from correspondent scott pelley, set to air this sunday. one of its most startling new claims, that three ex-teammates of armstrong have provided sworn testimony to a federal grand jury in los angeles that they witnessed the seven-time tour de france champion taking performance-enhancing drugs. >> it appears the federal investigation, with its subpoenas and sworn grand jury testimony, has broken cycling's code of silence. we don't know

>> cbs' armen keteyian, thank you very much. joining us now, bill strickland, editor at large for "bicycling" magazine, who had unique access to lance armstrong during this 2009 comeback tour. he joins us now. good to see you this morning. >> hi, chris. >> we just heard the "60 minutes" piece, tyler hamilton, at least two others coming out, testifying before a grand jury that lance did, in fact, use performance-enhancing drugs. is this evidence now credible enough that he finally needs to say, you know what, i did do it? >> it certainly -- the fact that tyler is corroborating floyd, both of them independently have some credibility problems. the fact that they're both saying the same thing is pretty damaging to lance. the news about george hincapie is probably more damaging than tyler. >> we also heard from frankie andrew that he noticed teammates in the armstrong era all getting faster. it was very, very difficult to compete with competitors who were using epo, and other performance-enhancing drugs. was it one of those elements