Duolingo coworkers cross 15 bridges in 20-mile ultimate Pittsburgh nerd hike
(World News USA)

The crew from Duolingo poses for a photo as they cross the 31st Street Bridge during their Eulerian circuit of 15 Pittsburgh bridges.` src = `https://triblive.com/rss/photos/?STREAMOID=voQaKFMrFU0NnuNpAFBaxc$daE2N3K4ZzOUsqbU5sYs3vzAknvQ6H5GHhVJh66XhWCsjLu883Ygn4B49Lvm9bPe2QeMKQdVeZmXF$9l$4uCZ8QDXhaHEp3rvzXRJFdy0KqPHLoMevcTLo3h8xh70Y6N_U_CryOsw6FTOdKL_jpQ-&CONTENTTYPE=image/jpeg`> More than a dozen bridges cross Pittsburgh`s three rivers, linking the North Side, the South Side, Lawrenceville, Oakland, Downtown and more. But can you cross ... ......