Dr. Martin Luther King wears a lei outside of Selma, Ala., March 21, 1965 on the first day of the march for voting rights from Selma to Montgomery. (Matt Herron/Jeannine Herron/Dept. of Special Collections and University Archives, Stanford University Libraries via AP)

Charles Campbell, who traveled to Alabama for the march from Selma to Montgomery, placing a lei on Dr. Martin Luther King, Jr. at Brown Chapel AME in Selma, Ala., March 21, 1965. (Matt Herron/Jeannine Herron/Dept. of Special Collections and University Archives, Stanford University Libraries via AP)

This image provided by the Natural History Museum shows a fossil found in Antarctica that belongs to a group of dinosaurs called titanosaurs. (Natural History Museum via AP)

This image provided by the Natural History Museum shows a fossil found in Antarctica that belongs to a group of dinosaurs called titanosaurs. (Natural History Museum via AP)

This image provided by the Natural History Museum shows a fossil found in Antarctica that belongs to a group of dinosaurs called titanosaurs. (Natural History Museum via AP)

This image provided by the Natural History Museum shows a fossil found in Antarctica that belongs to a group of dinosaurs called titanosaurs. (Natural History Museum via AP)

Dr. Martin Luther King wears a lei outside of Selma, Ala., March 21, 1965 on the first day of the march for voting rights from Selma to Montgomery. (Matt Herron/Jeannine Herron/Dept. of Special Collections and University Archives, Stanford University Libraries via AP)

Nona Ferdon, a graduate student who accompanied the Hawaii delegation that traveled to Alabama in 1965 for the march for voting rights, attends the march in Selma, Ala., March 21, 1965. (Matt Herron/Jeannine Herron/Dept. of Special Collections and University Archives, Stanford University Libraries via AP)