An example of a 20/20 Challenge project:
"Challenge 20/20 is an Internet-based program that pairs classes at any grade level (K-12) from schools in the U.S. with their counterpart classes in schools in other countries; together, the teams (of two or three schools) find local solutions to one of 20 global problems. Schools do not have to be NAIS members to participate. We accept private, public, charter schools from the U.S. and any other country. Schools can be elementary or secondary schools. There is no cost to participate in Challenge 20/20 and no travel required."