It's hard to really understand big problems. The best communicators know how to make statistics real. There's a group of San Diego college students who are making the AIDS statistics of Africa real on their campuses by

1. Wearing orange t-shirts at school to replicate the proportion of children who are orphaned by AIDS in Sub Saharan Africa-one out of 20

2. They are also inviting people to experience AIDS through a 1600 sq ft interactive exhibit complete with audio and visuals telling the story of people's lives affected by AIDS

Read more about it here Acting on Aids