One of the things I love about training is seeing how the science can be applied to new situations. This point is made in the following link that introduces Bart Weetjens and his clicker trained rats. For the past seven years, Weetjens has been running a unique lab in Tanzania, where he trains rats to sniff out deadly unexploded land mines — the legacy of countless bloody conflicts. Although dogs have traditionally been used to help humans detect mines, Weetjens realized that rats are lighter, cheaper to maintain and less susceptible to tropical disease. You can find the video at http://www.pbs.org/frontlineworld/stories/tanzania605/video_index.html