I remember learning about Martin Luther King Jr. when I was a kid. But MLK did not become more than the name of a three-day weekend until I read his Letter from a Birmingham Jail. As I read the letter, I could feel the urgency of his cause and the pain of the injustice. In celebration of his life, go ahead and read the open letter that Dr. King wrote from city jail in order to defend peaceful demonstrations and insist that "injustice anywhere is a threat to justice everywhere."
And while you're at it, watch the full version of his "I Have a Dream" (above). We all know at least one famous line from the remarkable speech, but there is something extremely powerful about watching Dr. King deliver his dream of racial harmony.