Parkland students speak out about their new book Emma Gonzalez, Matt Deitsch and Delaney Tarr appear live on "GMA" to discuss their new book and their movement to encourage young people to vote.

Candles that were placed on crosses still glow after last nights vigil for victims of the mass shooting at Marjory Stoneman Douglas High School, at Pine Trail Park, Feb. 16, 2018, in Parkland, Fla.