Zombies

I don't watch Walking Dead, mostly because I think Rick is (perhaps appropriately) a cartoon character and not particularly likable.  That said, zombies are fun.  This zombie infection calculator is neat, but I think it is missing something, namely, transportation.  While a zombie may cover ground at a walking/running pace an infected but not yet zombie could get in a car and move lots faster.  

The actual infection rate would probably depend pretty heavily on awareness and countermeasures.  So that calculator is probably wrong but it's not clear how to make it better.