Over the course of 2008, Bangladeshi farmers killed an estimated 25 million rodents. That is the recorded number, at least, and the real figure is undoubtedly much higher. What is beyond dispute is the name of the man who slew the most rats: Binoy Kumar Karmakar. Using a range of techniques that evidently included traps and poison, Karmakar has killed 39,650 rodents. And there is little room to doubt his prowess, as he kept the tails of the unfortunate rats as evidence.