"Timescape" finds words in the news associated with Sept. 11, and weights them according to prominence in a story — not just how often they appear. Gaurav Bradoo hide caption

itoggle caption Gaurav Bradoo

Spike Lee directed, wrote and starred in "Do the Right Thing." The landmark film prompted a national conversation about racial tension. Universal/The Kobal Collection hide caption

itoggle caption Universal/The Kobal Collection

Senate Minority Leader Mitch McConnell holds a rifle on stage at the Conservative Political Action Committee annual conference earlier this year. Susan Walsh/AP hide caption

itoggle caption Susan Walsh/AP

Juan de La Cruz operates a drilling rig that is probing for groundwater 2,500 feet beneath Fresno County. Sasha Khokha for NPR hide caption

itoggle caption Sasha Khokha for NPR