tom hanson spent time with a youth league in pennsylvania that's finding another way to teach the fundmentals>> we're going to run it on three. >> reporter: football is a way of life in pennsylvania. how important is the ball to you and your friend? >> to me, it's like everything. >> reporter: several days a week as the sun begins to set. >> let's go. let's get our flags on. >> reporter: the kids at this youth football league suit up to learn a contact sport with no hitting. windber has joined a number of schools turning to flag football for its youngest players. >> when we were playing tackle it was like every game we were sending them over to the ambulance for the concussion protocol. it just got to the point where like this is crazy. >> reporter: in a paper published this fall, they recommended flag football as a standard for kids before age 14. dr. robert cantu is a concussion specialist. at boston university. he says children are more vulnerable to hits because their heads are disproportionately bigger than their bodies and their necks are weaker. >> people that start playing tackle foot

tom hanson has details. >> the center for disease control is reporting 127 cases are under investigation for acute flaccid myelitis, afm. 62 cases have been confirmed. in 22 states. >> this is a mystery disease. we don't know what's causing this increase in cases. for some of the previous cases we've identified one pathogen or another, but we have no unifying diagnosis. >> afm affects the nervous system, specifically part of the spinal cord and can in some cases be caused by a virus. muscles and reflexes are weakened and some cases have been reported recently in minnesota and illinois. more than 19% of cases in children 18 years old and younger. >> we first detect and increase of afm in 2014 and then in 2016. so far in 2018 we're seeing a similar increase. >> in 2014, 120 cases of afm were confirmed. in 2016, there werertile itar parents should seek care right away if they're child has sudden onset of muscle weakness in the arms or legs. tom hanson, cbs news, new york. >>> the midterm elections are less than three weeks away. 35 senate seats and 26 of them held by democrats in play with

. >> cbs reporter tom hanson is live in new york with more on the investigation. tom? >> reporter: yeah, well, the time warner center is back up and running after a pretty chaotic day. it's one of several locations nationwide where explosive devices were discovered. this is a photo of the bomb sent to former cia director john brennan at cnn's new york studio. police say the package also included an envelope containing white powder. >> it appears that an individual or individuals sent out multiple similar packages. >> reporter: another bomb addressed to former presidential candidate hillary clinton's new york home was discovered at a postal facility over. >> we are fine thanks to the men an women of the secret service who intercepted the package addressed to us. >> reporter: other devices were identified before reaching and democratic t barack obama, representative maxine waters. all the packages have the return address of former dnc chair debbie wasserman schultz. >> there's a pattern here obviously. and we don't assume this is over. >> reporter: the threat at new york

tom hanson, cbs news, new york. >>> who are the baseball giants looking at as the next general manager? and the new york football giants, ha, they're having issues coming up. >> and taking a live look out at the beautiful golden gate bridge. it's friday! you made it to the end of the workweek. we're going to tell you what to expect for the rest of the day when it comes to weather and traffic. we'll be right back. back to that unfortunate sharks game at madison square >>> we are tracking slowdowns on the eastshore freeway. westbound 80 at san pablo avenue, we have an accident. we'll have more details and backups coming up but first sports with dennis. >>> i got good news for the 49ers in monday night's game in green bay. wide receiver marquise goodwin is off the injury list and practiced yesterday. bad news, fellow receiver trent taylor took his place on that list with a bad back injury. >>> packers quarterback aaron rodgers missed practice yesterday. don't be fooled, 49er fans. he will be front and center monday night. rodgers has been playing through a knee injury from week one. so do

tom hanson, cbs news, new york. >>> new research has found that not exercising is even worse for your body than smoking. the study published in the journal jama network open followed 122,000 people over 23 years. researchers found that avoiding aerobic exercise is actually worse for you than smoking, diabetes, even heart disease. in fact, the most sedentary study participants had almost double the mortality risk as someone on dialysis. >>> still to come putting the spotlight on teen suicide. >> do you think you'll save a life with this documentary? >> i would love to be able to say that. >> the new look at the dark side of growing up in silicon valley. >> and a silver lining to the end of sunday, a little cooling we'll have all the details after a break. and you find that brand... no. ...for how much? yes. that's yes for less. fall's best accessories are even better when you find them for less. at ross. yes for less. ...to find your new fall look at an "oh, yeah" price. check this out. that's yes for less. from the latest trends to your favorite brands, it feels even better when you f