For the month of November, the founders of Atlas Obscura - my fiance, Dylan Thuras, and writer, Joshua Foer - traveled around South America, seeking out the hidden wonders of the continent. (I spent most of the month with my family in Maine, hoping Dylan wasn't dead in the Amazon somewhere, covered in exotic insects.) Their reports are being featured, through a series of articles, videos and slide shows, on Slate for the month of February. The first installment went up today, on Caño Cristales, a rainbow-colored river in Colombia. I contributed in my own small way - I created the titles and map in the video - and as always gave Dylan my ruthless feedback as he worked on it.