Jimmy Fallon August 9, 2017 4:16 am ‘Tonight': Derek Hough Reveals ‘World of Dance' Winners Les Twins Derek Hough joins Jimmy Fallon to introduce the “World of Dance” winners Les Twins before their “Tonight Show” performance. US & World Videos 1:21 Watch the trailer for NBC's My New Favorite Olympian 2:03 Girl, 14, arrested in murder of 79-year-old grandmother in Lauderdale Lakes 0:45 Girl, 14, arrested in murder of 79-year-old grandmother in Lauderdale Lakes 0:59 Aerial view of Lauderdale Lakes apartment where 14-year-old allegedly murdered grandmother 1:46 Heat waves getting hotter, longer, and more frequent because of climate change