Now that director Christopher Nolan's Interstellar is finally out, its stars, Matthew McConaughey and Jessica Chastain, are free from keeping the highly guarded film a secret. Now we know that the film follows a father (McConaughey) who launches into space to save the human race from a dying Earth, and his genius daughter (Chastain) who rallies from beneath the stars to help him. (We'll spare you—that's putting it simply.)

But all those months of dodging questions from press, and even curious friends and family, have made Nolan's two leads the masters of secrecy. So learn from the pros as they discuss the intricacies of Interstellar, and how they kept from spoiling it.