marita davidison is a biologist specilaizing in ecologyand evolution now she shows us the high tech tools that are exposing what even the eye can't see. >> so where it's blood red, that's where the mercury polution is most intense. >> we'll share our findings with lindsay moran she's an ex -cia anaylist. that's our team, everything we've been seeing... it's for this... now let's do some science. hey guys welcome to techknow i'm phil torres joined by lindsay moran and marita davidson. this upcoming episode is an important one to me it takes place in peru where i've done alot of my research and it is a tale of contrast we will see a rainforest full of new species and then we will see the devastation that humans have done to extract gold. >> and as we know with devastating stories like this, where there is a lot of damage science can play a role here not just in monitoring and discovering what's going on but in trying to help process. >> i think this is a story having looked at some of the images that one image of the devastation pretty much says it all. >> absolutely, this is an important s