Space Camp is a great way to get kids interested in math and science. They really do have a wonderful curriculum (for all ages) that is very real to what the astronauts experience. It also teaches them team work as they are each part of a launch team and stay in dorms configured like the space station. They even have a mission control simulation in braille so that blind handicap kids can participate. There is a space camp for adults and educators also. The actors of Apollo 13 (including Tom Hanks) spent time in space camp in preparation for their movie. I am very glad your grandson is able to have this experience while also having a fun time. For anyone interested here is the link for more information:
http://www.spacecamp.com/