NPR’s ‘Book of the Day’ podcast Martin Luther King Jr. didn’t originally set out to become a civil rights activist, according to his biographer. On a Jan. 3 episode of NPR’s Book of the Day podcast, Jonathan Eig,

The dual celebrations of a second Trump inauguration and the civil rights leader’s birth raise profound questions about Black leadership and progress toward the Rev. Dr. Martin Luther King Jr.’s dream.

Every year we honor the legacy of Martin Luther King Jr. in January. Here's everything you need to know about the holiday.