The Probability of Everything

I read this book on a recommendation of another teacher.  For the first half of the novel, I was a little confused as to why he would love it so much.  It was an interesting premise but still.... not what I would call memorable or special.  Then, it happened.  The twist.  Read this book about Kemi, a girl who loves math and probabilities, who is preparing for the end-of-the-world asteroid strike of the Earth and who is compelled to create a time-capsule so they will not be forgotten.  (FIC EVE)