diseases. >> what is clear, there are bureaucratic hoops most researchers simply don't want to jump through. neuroscientists, carl hart. >> there are not many people studying marijuana. it's very difficult to get approval to study marijuana. >> what's nice about israel is the government is helping the research to happen. >> it's research that could give hope to patients like >> i made this. >> scientists in israel are learning marijuana use might actually protect the brain, not damage it. >> they've been able to show it can decrease the amount of brain damage from head injuries in mice? >> to give evidence to reverse some of the injury after damage, that's huge. >> you want to paint your nails? i'll paint your nails. >> i literally see charlottes brain making connections that haven't been made in years. it's almost seeming to build her brain where before it seemed