Museums on college campuses are a resource for enrolled students, but they let the rest of us continue our education too—often for free. Many focus on a specific region or era of history, magnifying details that might get overlooked in a more comprehensive museum. And university gardens function as teaching laboratories for horticulture students, as well as soul-soothing spots to escape the academic grind.While Texas universities are home to three presidential libraries and numerous art galleries, they also host a slew of small but excellent museums and gardens. If you’re touring campuses with your teenager this fall—or you just need some food for thought—check out these eight museums and two stunning university gardens.Centennial Museum and Chihuahuan Desert Gardens El PasoMust-see: a spectacular, multicolored beaded jaguar, nearly…