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Aris nose, a so-called endoscopic skull based surgery, to reach and remove the tumor. to get there, they first had to come here, stanfords virtual reality center, where aris brain and tumor were precisely mapped out surgeons spent hours practicing in a virtual o.r. and on a 3d printed replica of aris skull. >> if you go one millimeter beyond and youre not careful, you can hit the carotid artery and get a major bleeder. >> reporter: on surgery day, the stakes and tensions were high. >> im bawling...

Over the next decade ive 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 peoples success. at the same time, i think we...

>> 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 aris 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 a...

At 33, the oldest player on any major college team this year they call you pops. >> yeah, yeah, thats 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, its hard not to be impressed. >> reporter: griffins 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 t...