Many children growing up in the sixties assumed that by the time they were adults they would all be travelling in spaceships and making regular trips to the stars. Of course it hasn't quite worked out that way..... but in central Minnesota, the children of some of those wanna-be intergalactic explorers ARE getting a practical lessons in outer space. One teacher in Sauk Rapids has teamed up with the National Aeronautics and Space Administration--NASA--to teach students about space and aeronautics, but also about how to learn. . . . Minnesota Public Radio's Gretchen Lehmann (lay-mun) reports: