What does this mean? Hi everyone! I can't understand the last sentence, particularly the part 'crack one open' . "Like me, you might have a nice collection of dusty Berlitz phrasebooks hanging out in your garage, left over from your last European vacation. You might even crack one open to learn to say (unintelligible) SCIENCE FRIDAY." (http://www.npr.org/2011/02/25/134059279/being-bilingual-not-only-a-boon-for-native-tongues)