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Ari's nose, a so-called endoscopic skull based surgery, to reach and remove the tumor. to get there, they first had to come here, stanford's virtual reality center, where ari's brain and tumor were precisely mapped out surgeons spent hours practicing in a virtual o.r. and on a 3d printed replica of ari's skull. >> if you go one millimeter beyond and you're not careful, you can hit the carotid artery and get a major bleeder. >> reporter: on surgery day, the stakes and tensions were high. >> i'm bawling i can't handle it. it's too much. >> reporter: for 16 hours doctors removed the tumor piece b...

Over the next decade i've proposed a wealth inequality tax that would apply to people with assets in excess of $40 million. >> reporter: castro would not tax owned wealth in total. rather, he proposes a tax for the richest americans on things like stocks and bonds, as they increase in value. but if i work that hard to make that money, i think a lot of people feel like i would be able to keep that money. >> you are going to keep some of it. i celebrate people's success. at the same time, i think we need a fair tax system that actually allows for us to make sure that other people can also reach ...

>> reporter: at 2 years old ari ellman was like most toddlers, a boy so full of life his parents called him lion but then sudden changes, low energy, vomiting and unexplained seizures. >> we were like this is not just a virus. >> reporter: tests confirmed their worst fears, a rare and life threatening tumor growing deep at the base of ari's brain. desperate to save their son, the ellmans turned to hospitals around the country searching for a treatment. >> how do you start to even wrap your head around what's next >> reporter: their best option was also the most risky ari needed special surgery...

At 33, the oldest player on any major college team this year they call you pops. >> yeah, yeah, that's the nicer way of saying it, yeah. >> reporter: football director tom ehlers recalls th veteran humbly asking for a chance to play. >> once you meet him, it's hard not to be impressed. >> reporter: griffin's teammates agree. >> the way he was definitely pushes me. >> reporter: griffin says his next mission could be law school, the military, even public office. >> i hope that someone is sitting on the couch can, you know, see what i'm doing and realize that as long as you have air in your lungs...