thank you all for joining us, ma ris sass lagos, rachel grana and michael mullins. after more than a decade of puttering long, hydrogen powered vehicles may soon be kicking off in california. they emit only water vapor from the tail pipe. governor jerry brown recently signed legislation to fund more hydrogen refueling stations and manufacturers like toyota are coming out with new car mod did hes. still the vehicles have a lot of catching up to do with other alternative cars already on the road. scott shafer narrates our story. >> like most people, bill holloway commutes to work, driving 75 miles from his home in alameda, california. but then again, most people don't make their commute in a hydrogen fuel cell vehicle. >> i drive a very rare car. there's only a handful on lease here in northern california. >> this rare car uses hydrogen instead of gasoline and emits only water vapor instead of harmful pollution. >> the economy of this mercedes is great. i average 58 miles per kilogram of hydrogen, the same as 58 miles in gas. i picked the hydrogen car because i was ab

grana who is like our most knowledgeable expert. >> thank you very much. thanks, dr. glance. i appreciate this opportunity to address the committee. again, my name is dr. rachel [speaker not understood]. i also live in the inner sunset. last fall we prepared this background paper. it's already been discussed. the world health organization, it reviewed 80 studies that have been published on e-cigarettes. we found some important and new conclusionses that i'm going to review today. so, in the past few years, e-cigarette use has increased rapidly. not only among adults, among children as well. youth, teens, and [speaker not understood] from the cdc just referenced reported back from 2011 to 2012, e-cigarette among youth doubled with about 3% of middle school [speaker not understood] and 10% of high coolers. however, some of these kid had not even ever used tobacco cigarettes. the e-cigarette might represent a new way for them to create a nicotine addiction and puts them at risk for tobacco smoking. e-cigarettes come in kid friendly flavors aptly described today. [speaker not understood] electronic cigarette marketing online, and we found that e-cigarettes are pr