Cambodia is calmer this week following a truce with Thailand. The two countries have been battling over parts of their shared border — a clash involving artillery shells raining down and even airstrikes. Many in Cambodia hope the fighting stops for good. The nation’s countryside is already strewn with landmines and unexploded bombs left behind by older wars. Clearing those explosives is still a daily job for brave men and women. Luckily, they have a little help from some very little creatures: rats who sniff out mines. The World’s Patrick Winn reports from Bangkok.