Today on the Gothamist Newsmap: multiple manhole fires on Marcy Ave. in Brooklyn, a shooting on Gunhill Rd. in the Bronx, and a stabbing on 7th Ave. in Manhattan. The NYTimes examines the ground beneath our feet and finds out where the city's asphalt comes from and how it's produced. The lives, loves, and world of Second Lifers, where people inhabit a virtual world of their and others' making. Public Advocate Betsy Gotbaum, who......