Oops. In this hour of Radiolab, stories of unintended consequences--from a psychologist whose zeal to safeguard national security may have backfired, to a toxic lake that spawned new life.

Martin Luther King Day takes on special meaning when it’s also the eve of the inauguration of America’s first African American President. WNYC reporters in Washington and speechwriter Michael Cohen look at the overlapping of history and current events. Also, excerpts from Sunday’s MLK event, “A Journey of Hope: ...