English: Educational opportunities differ greatly between richer and poorer countries. Some differences, such as better-equipped schools in rich countries, are obvious. Others are not. These two boys are enthusiastically learning how gears work. These boys had never had an opportunity to play with any such toy. This is one of many hands-on experiences offered at a "Discovery Day" in Kiu Kajam, a mountain town between Luang Prabang and Vientiane, Laos. The events are organized by Big Brother Mouse, a literacy project in Laos. At each event, students can try more than 30 activities that they've never done before: play number games, examine fossils, construct an arched bridge, and look at bacteria through a microscope.