i'm elaine reyes in washington, d.c., and this is "americas now." first up: dengue fever, the type that can kill you, is on the rise. now after decades of attempts, researchers have developed a vaccine. translator: the vaccine still saves you lots of money compared to what you'd have to spend if you got the disease. [man speaking spanish] reyes: correspondent gerry hadden reports on fighting dengue in mexico, and tells us about the vaccine's availability in latin america. next, imagine a bicycle blender that can not only grind corn but also make shampoo. for this week's game changer, meet the founder of maya pedal-- mario juanes.

i'm elaine reyes in washington, d.c. and this is "americas now."rst up, the ruins of machu picchu are one of the americas' most remarkable historic sites and peru's top tourist attraction. they're also a striking symbol of the long-lost inca empire. man: we have 14,000 years of history that is not recorded by--in writing, but is recorded in our dna. dan collyns: one can't help but be impressed... reyes: correspondent dan collyns reports on an investigation to identify royal descendants from the ancient inca civilization. next, a woman with a genetic

i'm elaine reyes in washington, d.c. and this is "americas now."st up, civil war in el salvador killed tens of thousands of people in the 1980s and '90s. an amnesty law has protected those who committed crimes from prosecution. now that law is being lifted. [man speaking spanish] translator: the law must be the same for all. you cannot have second-class citizens. reyes: correspondent harris whitbeck tells us what effect repealing amnesty could have on the country. next, gangs and violence in central america have forced young residents to migrate north. many make it to shelters in mexico, where they can remain for months. this week's game changer is helping them with bicycles. we'll introduce you to the founder of quiquica,

i'm elaine reyes in washington, d.c., and this is "americas now." first up: michelle begue shows us how the clearing of bogota's most dangerous zone has shone a spotlight on the city's grave homelessness problem. then, a tide of brazilian immigrgration ows s in portugal. a return to the motherland and what it means for both countries.

i'm elaine reyes in washington, d.c., and this is "americas now." ren] first up, is it a triple threat? richardsds: so this isis the ony motorway... reyes: correspondent joel richar e explores ee challenges paraguay,y, argenti,, and brazilil face in keeping drugs, arms, and illegal business away frfrom their shahd border. next, information that c s save ves.s. we et a r resrcher whoahd is using technology to pave ne paths to healthchce in rural guatemala.

i'm elaine reyes in washington, d.c., and this is "americas now." first stop--haitian refugees look for a new home in central america in a search that is grinding to a halt. [protesters chanting] elaine: and later, painting outside the lines, one artist's quest to turn the u.u.s.-mexican border i into a symbol of fraternity. ♪ ♪

i'm elaine reyes in washington dc, and this is "americas now." first up, they took back their own town after it was ravaged by racketeering. now thresidents rule themselves, but autonomy is not ways easy. then, costa rica wants to become the world's first fossil fuel-free nation. we'll take a look at the country's pioneering commitnt to clean energy.

i'm elaine reyes in washington, d.c., and this is "americas now." first up, ecuador has given its financial system an overhaul. it is now the first nation in latin america to use electronic currency. how is the country responding to the revamp? and later, years of being hunted for its skin have made south america's orinoco crocodile almost extinct. one man is trying to stop the population from declining further. meet this week's game changer rafael antello.