In ""Tonight," With New Host, Set to Reclaim Its New York Roots," Bill Carter writes about a big transition in the works at "The Tonight Show." WHO has NBC selected to replace the "Tonight Show" host Jay Leno when his contract ends? WHO was the "Tonight" host before Mr. Leno? WHO does NBC see as its biggest late-night competitor? WHO is your favorite late-night host? WHERE will "The Tonight Show" move? WHEN is the switch expected to take place? WHEN, according to this timeline, did NBC make transitions in "Tonight" since 1990? HOW is Jimmy Fallon's comedy style different from Mr. Leno's? HOW has NBC fumbled with previous "Tonight Show" transitions? WHY would Mr. Fallon prefer to stay in New York City instead of filming the show in Burbank, Calif.? WHAT show is Mr. Fallon currently the host of? WHAT other late-night shows are based in New York City? Related: Our Student Opinion question "Is TV Stronger Than Ever, or Becoming Obsolete?" and our lesson "That's Funny: Comedy Across the Curriculum"