Monday is "MLK Day" in the U.S. Beyond all of his accomplishments, Dr. King left us an important question to ponder. "Life's most persistent and urgent question is: 'What are you doing for others?'" MLK Day, thus, is also a Day of Service. What Are Some Little-Known Facts about MLK? What Was His Birth Name? Why Did He Write a Letter from the Birmingham Jail? What Role Did Dr. King Have In the Selma March? On November 2, 1983, President Reagan signed a Bill creating a national holiday to mark the birthday of Dr. Martin Luther King, Jr. Mrs. King was present at the signing ceremony and also spoke to the gathered crowd. What Did MLK Convey in the "I Have a Dream Speech?" What Speech Made "We Shall Overcome" a Rallying Cry? When Did Dr. King Give His "Mountaintop" Speech? Who Was Mahalia Jackson, Dr. King's Favorite Singer? How Did MLK Work with LBJ on Voting Rights? What Song Did MLK Ask Mahalia Jackson to Sing? How Many People Made the Selma-Montgomery March?