halley jackson, nbc news, los angeles. >>> one more note on this tonight, we're joined by dr. nancy snyderman. and nancy, i know your view is, forget measles. the comebacks could not perhaps stop at measles. >> you and i have sat here for the last few months talking about whooping cough, mum ps, and measles. these outbreaks aren't an accident, because we've become rather lax, we forget what these diseases look like, and we forget that they kill, and that a simple vaccine can prevent these illnesses. it's inherently important that those of us who are healthy vaccinate ourselves to protect those who are less vulnerable to society. that's why it's called public health. what concerns me, that this may be the canary in the coal mine. we see a break in public health in this country. there is no debate. vaccines save lives. what if a year, two years from now, you and i are sitting here talking about the first case of polio in this country. i don't think we can be so cocky as to say that can't happen. so this should be the call to arms. >> dr. nancy snyderman with a cautionary note he

nbc's halley jackson shows us a one of a kind way that the groundskeepers have been getting the grass ready for tonight's big game. >> reporter: football's biggest names are ready for the sport's biggest game but these mvps don't get a red carpet. instead -- >> johnny you ready? >> reporter: crews roll out something greener. >> ready? go! >> reporter: you've heard of a retractable roof? this is a retractable field. a turf surface that usually lives outside the stadium. >> it allows the field to be maintained out there in the bright heat of the arizona sun. >> reporter: but before game time the grass makes its move on a kind of tray. the only one like it in the country. in a game of inches that's how the field rolls in. a little at a time until 19 million pounds of turf is under the dome and under the close watch of groundskeepers. >> really from every point here on, it goes down a notch spop. so we have to really start rubbing on it and paying attention to it. >> reporter: 92,000 square feet of grass meticulously maintained and babied until the big day. >> field crews are actually bru

the "today" show's halley jackson will join with us a live report come up at 6:50 this morning. >>> historic concerts, classic sporting events and decades of memories, the venue that hosted it all is crashing down. starting today, crew also start tearing off the facade of candlestick park. >> "today in the bay's" stephanie chuang joins us live at the stick this morning. this is a long, drawn-out good-bye. they've already hollowed out the inside and now moving outside. >> reporter: that's right. good morning to you both, sam and laura. today is the first time people will see some of the changes as crews work to tear down to start the demolition of the outside, the exterior of candlestick using wrecking machines, not wrecking balls, for precision purposes. inside as you mentioned, demolition has been under way, bird's-eye view from our nbc bay area chopper yesterday shows there's not much but debris piles inside. the idea of an implosion was nixed after the community voiced concerns about noise, vibration but mostly health impacts from dust and asbestos. one of the people leading that effort s