The Affects of the Killing Fields

We were doing an English lesson with about fifty kids teaching them words such as father, mother, grandmother, and grandfather. We would often ask how many of them have a grandmother or grandfather. When we asked if they have a grandmother pretty much all of their hands were up. But then we asked how many have grandfathers and four out of the fifty kids had a grandfather. We first thought we had asked incorrectly but found out that many of their grandfathers died during the killing fields...crazy.