and securing the survival of them ebs black rhinos -- namibia's black rhinos. believe it or not, your hair and fingernails have a lot in common with rhino horns. they all contain the protein keratin. the differences, rhino horns are sought after, specifically for this substance. many people believe that keratin has healing properties that can improve fertility, for instance. 2013 saw a new peak with an estimated rhinos killed -- 100 50,000 rhinos killed in africa alone. the rhino populations have shrunk. the original habitat, there has been an effort led to repopulate. in some places they are already extinct. the black rhinos of namibia narrowly escaped extinction, largely due to businesses who help them escape this lucrative business without even touching them. >> it shortly before sunrise in the namibia desert, but these men are ready to break camp. they are rangers with the save the rhino trust. the men want to set off as early as possible, because temperatures will soon climb to over 40 degrees celsius. the group will be spending three weeks in the wilderne

educating children and teenagers, as here in the baby a -- in namibia is a good place to start. >> about time to give our kids that pep talk on what to do with plastic waste. and as we saw in that report, plenty of bits of plastic chairs are also floating in our oceans. like no other plastic product, except the plastic bags of course, a so-called monobloc chairs epitomize the plastic revolution of our society. at less than three euros production cost, they are cheap, convenient, and some even say sheikh. judge for yourself. >> this is henning wotzel- herber. he lives in hamburg and is partial to chairs. more precisely, the monobloc c hair. >> plastic chairs are basically like people. all people are alike but different. and all plastic chairs are alike but different. they have different shapes, colors, and sizes, and in the end, they are somehow all the same. >> a chair has to have specific characteristics to be considered a monobloc. it has to be injection molded and made of polypropylene. these plastic chairs have been produced the world over since the 1970's. their exact origin is vagu

they are a people who live in namibia and botswana, in southern africa.ve in a semi-arid or desert region. it's a very tough environment in which to survive. and they are hunter-gatherers. they are people who live o the land. people survive really on the margins in that envinment. it's very easy to go across the line and to get into real trouble through sickness. so the alleviation of sickness and suffering is a regular need that has to be addressed. the healing ceremonies that the kung perform are one way of addressing those needs of restoring balance and harmony and health. the sound of the music itself is a healing sound. the music comes to people on a subconscious level. it gets right to the core. and it has a way of transforming you. one of the most interesting things about the healing ceremonies of the kung is that there aren't any words. there's no text at all. yet that music is very powerful, very moving, very, very emotional music. and how does that work? you know, you hear people singing, and they're yodeling. you hear this wonderful melody, lit

one year it was namibia. the next year, old-style vegas. where are people wanting to go these days? i wouldn't call it a little secret but certainly the most commonplaces don't actually change year to year. people love going to vegas, to london, to order, to new york city of course. so many popular destinations remain pop bar year in, year out -- popular. what is stunning when i look at our traffic not so much the one spot out of the way coming up but the fact that people are traveling much more and they're going off the beaten track, literally to thousand, tens of thousands of different places. international travel on the up swing. so we're becoming much more of a global community and that is wonderful to see. liz: you can't discount the impact of mobile then in all of that. how have you harnessed the power of mobile? and do you foresee a tipping point where just about everybody who uses trip advisor will be on mobile? >> i would say there is awful lot of people using trip visor this very moment on mobile. why? because of that convenience factor. so we're offering you a replacement

last year i took a trip to south africa -- well, namibia and south africa, and i saw cuban doctors working there. actually, sometimes along our own doctors from the center of disease control and prevention. interesting ... we can work with them there but we can't work with them here, i guess. also in havana, i visited a very interesting place called the latin american medical school. the latin american medical school right outside of havana, 20 miles west of havana, and it was an old navy base, navy -- what am i trying -- naval academy. and evidently, president castro decided they didn't really need a naval academy, so they closed it down and married it a medical scoovment -- and made it a medical school. people come from all over to go to medical school. believe it or not, there are students from america going to school in havana -- going to medical school. mr. president, this just blew my mind. i never heard of such a thifnlg here's what i found owvment i found out that in the year 2000, the congressional black kaw chose a trip to cay van navment during that trip they met with president