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Mathematical problem. it's like nothing you can compare it to. >> john ershell is talking about his passion for numbers w a master's in something called numerical analysis, he taught classes at his alma mater of penn state. there's only one other place ershell gets the same satisfaction. that's his job as an offensive lineman for the baltimore ravens. >> i love the aggressiveness. i love running around. i love just going out on the field, competing with people. >> he told us he has the best of two very different worlds. there's something beautiful about being able to split my year in half, whe...

First concussion. how much do you worry about brain injury? >> i have never been knocked out before, that's scary. and that scared me. and took me a while to get back. took longer nanna expected. but this is a sport i love, and to me, to be able to go back out there, continue to play football, it's just a blessing. >> how do you weigh the risk, the sport you love and the fact that the sport could do damage to this other extraordinary skill you have? >> i think you and my girlfriend would get along just perfectly. you same perfectly alined. is an issue of passion and i can only play the sport f...

How much do you worry about brain injury? >> i have never been knocked out before, that's scary. and that scared me. and took me a while to get back. took longer nanna expected. but this is a sport i love, and to me, to be able to go back out there, continue to play football, it's just a blessing. >> how do you weigh the risk, the sport you love and the fact that the sport could do damage to this other extraordinary skill you have? >> i think you and my girlfriend would get along just perfectly. you same perfectly alined. is an issue of passion and i can only play the sport for so long. i have...

Mathematical problem. it's like nothing you can compare it to. >> john ershell is talking about his passion for numbers w a master's in something called numerical analysis, he taught classes at his alma mater of penn state. there's only one other place ershell gets the same satisfaction. that's his job as an offensive lineman for the baltimore ravens. >> i love the aggressiveness. i love running around. i love just going out on the field, competing with people. >> he told us he has the best of two very different worlds. there's something beautiful about being able to split my year in half, whe...