warning is that? >> you may lose your vision like this for about -- within 24 hours. but go and see a doctor immediately. >> those tias are not to be taken lightly. people ignore it. >> because they're strokes in evolution. this is where the art comes in. that mobile unit could show up at your door. the scan doesn't yet show anything, that could still be the time to give that de solver. you don't have damage yet you may still want to give it in order to prevent damage. >> what's the risk factor for having a stroke? high blood pressure is major problem. @row sclerosis and diabetes. that's going to push all this stuff up to the brain. >> and smoking. and smoking too. >> smoking and alcohol. we want people to lose weight. last week we talk about mediterranean diet and exercise. >> just a quickie.