What is true bravery and how do people demonstrate it? Part of an extensive series of audiobooks, Aesop's 81-word fable "The Wolf and the Kid" tells the story of a boy that bravely attacks an enemy wolf from afar. Paired with a graphic...

Last week, a NASA mission paid a visit to comet Hartley 2, flying by at a distance of just a few hundred miles. We'll talk about what they learned in this audio lecture. [12:12]