You read that right. Rats who save lives. Let me back up a bit.

Cambodia has a tragic history of conflict in the 20th century. As a result, there are estimated to be between 4 million to 6 million unexploded landmines and unexploded missils in the country. Most of these are in rural areas where the expanding population is starting to farm and build. The result is a dangerous situation for all — especially children.

Landmines were placed in Cambodia from 1967 to 1998 — during the Cambodian...