Rating: All Ages
Word Count: 2979
Author's Summary: "Rose Tyler, you've faced clockwork droids, Slitheen and Cybermen, not to mention five different types of zombies and a megalomaniacal nightmare better known as the Emperor of the Daleks, and you're telling me you're afraid of some maths?"
Characters/Pairings: The Doctor (10th), Rose Tyler
Warnings: None. Unless you fear math.
Recced because: I love the few stories that actually try to get inside the Doctor's understanding of time and probabilities, and this one finds a wonderful visual metaphor for how he always seemingly knows what to do and when.