i think that's my best talent is my unwillingness to give up. >> and bill arnett has not given up.k that he has championed, finally getting its due, art exhibits, museums, even postage stampletion. >> look man i found some concepts. >> lonnie holly finally got a new york show. >> joyful noise. >> bill arnett is 74 now and stepping back from his life's work. but his son matt has picked up the baton, still looking out for the artists they discovered, still their art to the world. >> what is the "america tonight's" joie chen reporting. coming up, a new duke of uke? he's been dubbed the jimi hendrix of the ukulele. a musician who >> a remarkable quest that sparked imaginations and created history over 700 years ago, marco polo left venice to points unknown and mysterious relive this epic odyssey people encountered, discoveries made... and now... questions answered... al jazeera america presents marco polo a very modern journey >> and finally on "america tonight," he's selling out shows and his music videos have more than 12 million views on youtube. and it's all because of an unlikely

i think that's my best talent is my unwillingness to give up. >> and bill arnett has not given up.k that he has championed, finally getting its due, art exhibits, museums, even postage stampletion. >> look man i found some concepts. >> lonnie holly finally got a new york show. >> joyful noise. >> bill arnett is 74 now and stepping back from his life's work. but his son matt has picked up the baton, still looking out for the artists they discovered, still their art to the world. >> what is the "america tonight's" joie chen reporting. coming up, a new duke of uke? he's been dubbed the jimi hendrix of the ukulele. a musician who >> on tech know. >> that is immense... >> there a misunderstood... ...vital part of the ecosystem >> ...is a tiger shark... ...first one of the expodition >> can they be saved? >> sharks don't eat people... >> tech know, every saturday go where science meets humanity. >> this is some of the best driving i've every done, even though i can't see. >> tech know. >> we're here in the vortex. only on al jazeera america. >> and finally on "america tonight," he's sell