civil engineer david marr owns a company, that build the orinda, california if city hall.ou can see how the rocking frames are built into the are foundation. >> these cables are the spring and at the base are the steel angle is that shosh the energy. they work together creating the dynamic system of the building. >> how safe is this building? >> meant to be 25, this 30% stronger than an ordinary building. >> safer than your own house? >> yes, absolutely. >> so the future looks bright and safe in earthquake country. if they can build a safe bridge in the middle of two faults, the safe. >> do you see a day when all new buildings and structures would implement some of this new technology? >> we hope. you would think in cities when a big earthquake comes it would be an inconvenience, rather than a disaster and this rock frame is part of the technology. >> very interesting. what about a place like bolivia where you come from and there's a lot of earthquake risk? >> this is a technology that is costly, fundamentally costly so we can easily apply the to a country like the united

the theatre is home to david letterman, but the marr as been gech a retro look, looking how it did thisning 50 years ago. same headlines, same name and, of course, fans all weekend have been posing for pictures in front of it, and sharing their stories on the sidewalk. >> how many fans are you seeing and what are they telling you about that night? >> well, you know, 73 million people tuned in that eaching, and i spoke with a woman from pennsylvania who said that that was the evening she fell in love with paul mccartney. they say they never plimagined e impact that it would have on them. they didn't know it would be as big. what is fascinating is the music lives on for generations. i spoke with a 14-year-old fan who encountered the beatles on youtube, downloaded 80 songs and considered them to be the greatest band of all times. >> you're kidding, 80 songs. how was he introduced to them? >> social media. they are on youtube. they hear a song, go through all of them. his mum stopped me and said "i need to introduce you to my son, he is the biggest fan, you need to talk to him." >> i love i